| Oman | George W. | 577 | History of Sonoma County - 1880 |
| Omata | George J | 375 | History of Kings Co. - 1940 |
| Oneal | Louis (Hon.) | 538 | Biographical Record of Coast Counties - 1904 - Ver. 1 |
| Onesti | Lena Leoni | 665 | History of Tulare & Kings Cos. - 1913 |
| Onesti | A. | 665 | History of Tulare & Kings Cos. - 1913 |
| Oneto | Frank Joseph | 92 | History of Sonoma County - 1937 |
| Onken | William F | 1079 | History of Yuba and Sutter Counties - 1924 |
| Onstett | J. A | 554 | Biographical History of Northern California - 1891 - Ver. 2 |
| Onstott | Jacob | 990 | History of Butte Co. - 1918 |
| Onstott | George W | 416 | History of Yuba and Sutter Counties - 1924 |
| Onstott | John Paxton | 388 | History of Yuba and Sutter Counties - 1924 |
| Onstott | Lizzie Flynn | 388 | History of Yuba and Sutter Counties - 1924 |
| Ontiveros | Abraham | 364 | History of San Luis Obispo Co. and Environs- 1917 |
| Ontiveros | Abdon T. | 857 | History of San Luis Obispo Co. and Environs- 1917 |
| Ontiveros | Augusta (Mrs.) | 381 | History of San Luis Obispo Co. and Environs- 1917 |
| Ontiveros | Abraham | 1285 | History of South Coast Counties - 1907 |
| Ontiveros | Jose Dolores | 381 | History of San Luis Obispo Co. and Environs- 1917 |
| Ontiveros | Juan Pacifico | 364 | History of San Luis Obispo Co. and Environs- 1917 |
| Ontiveros | Patricio | 1104 | History of South Coast Counties - 1907 |
| Ontiveros | Kencho Salvador | 903 | History of San Luis Obispo Co. and Environs- 1917 |
| Ooley | John Harris | 646 | History of San Luis Obispo Co. and Environs- 1917 |
| Opdyke | Paul R | 842 | History of Sacramento County - 1923 |
| Opici | Michael | 986 | History of Solano & Napa - 1912 |
| Opp | Eberhard | 346 | History of Los Angeles Harbor District |
| Oppenheim | R. | 314 | Illustrated History of Sacramento County - 1890 |
| Oppenheimer | Selby C. | 1246 | Biographical Record of Coast Counties - 1904 - Ver. 1 |
| Oppenheimer | Charles (Sir) | 227, Vol. 2 | History of the San Francisco Bay Region - 1924 |
| Oppenheimer | Lady | 227, Vol. 2 | History of the San Francisco Bay Region - 1924 |
| Oppenheimer | Nellie | 227, Vol. 2 | History of the San Francisco Bay Region - 1924 |
| Oppenlander | Charles Henry | 726 | History of Mendoncino County - 1880 |
| Opperman | Julius | 446 | History of Solano County - 1879 |
| Opsahl | John | 528 | History of Ventura Co. - 1926 |
| Orcier | Romulus | 374 | History of Kern County - 1914 |
| Orcutt | J. H. | 290 | History of Ventura Co. - 1926 |
| Orcutt | Jacob H | 342 | History of Santa Cruz, San Benito, Monterey & San Luis Obispo Cos. - 1903 |
| Orcutt | W. W. | Vol. 4 - 795 | California of the South - 1933 |
| Orcutt | William W | 900; Vol. III | History of Los Angeles and Environs - 1915 |
| ORCUTT | Clyde | 149 | Dinuba War Album - 1944 |
| Ord | Robert B. | 253 | Historical and Biographical Record of So. Calif. - 1902 |
| Ord | John C. | 572 | History of Orange County - 1921 |
| Ord | George M | 611 | History of Santa Cruz, San Benito, Monterey & San Luis Obispo Cos. - 1903 |
| Ord | Edward Otho Cresap | 75 | Fresno County: The Pioneer Years to 1900- 1984 |
| Ord | Edward O. C. | ~ | Society of California Pioneers - 1912 |
| Ord | James L. | ~ | Society of California Pioneers - 1912 |
| Ord | Pacificus | ~ | Society of California Pioneers - 1912 |
| Ord | Pacificus | 177 | History of Butte Co. - 1918 |
| Ord | E. G | 361-Vol. 2 | History of Santa Barbara County - 1927 |
| Ordahl | George Ph.D. | 244 | History of Sonoma County - 1937 |
| Ordaz | Blas | 28-30 | Genocide & Vendetta: The Round Valley Wars |
| Ordway | Ed | 1041 | History of Mendoncino & Lake Counties - 1914 |
| Ordway | Ira | 817 | History of Mendoncino & Lake Counties - 1914 |
| Ordway | N. F. | 327 | History of Merced, Stanislaus, Calaveras, Tuolumne & Mariposa - 1892 |
| Ordway | Warren Arthur | 995 | History of Contra Costa - 1926 |
| Orear | J. W | 493 | History of Plumas, Lassen & Sierra Cos. - 1882 |
| Oreb | Frank | 1630 | History of South Coast Counties - 1907 |
| Orebaugh | Paul | 286 | Shenandoah Valley Area of Amador Co. - 1854-1904 |
| Orebaugh | Paul R | 286 | Shenandoah Valley Area of Amador Co. - 1854-1904 |
| Orella | Antonio J. | 1164 | Historical and Biographical Record of So. Calif. - 1902 |
| Orelli | Abraham T. | 1751 | History of South Coast Counties - 1907 |
| Orelli | A. J. | Vol. 3-372 | History of Sacramento Valley - 1931 |
| Orena | Don Gaspar | 452 | Historical and Biographical Record of So. Calif. - 1902 |
| Orewyler | Jack | 173 | Tulare Community War Album - 1945 |
| Orgill | Gary | 190 | Shenandoah Valley Area of Amador Co. - 1854-1904 |
| Orgill | Robt. L. Jr. | 190 | Shenandoah Valley Area of Amador Co. - 1854-1904 |
| Orgill | Robt. L | 190 | Shenandoah Valley Area of Amador Co. - 1854-1904 |
| Orion | John R | 410 | History of Santa Barbara County - 1939 |
| Orisio | George | 1 #105 3/75 | Los Tulares: 1948 - 11/86 |
| Orlandi | Joe | 315 | Shenandoah Valley Area of Amador Co. - 1854-1904 |
| Orloff | Sam | 354 | History of Kern County - 1929 |
| ORLOPP | Louis | 150 | Dinuba War Album - 1944 |
| ORLOPP | Oscar Mr & Mrs | 150 | Dinuba War Album - 1944 |
| Orlopp | James | 118 | Orosi: In the beginning: 1888-1988 |
| Orlopp | Family | 109 | Orosi: In the beginning: 1888-1988 |
| Orman | R. | 102 | History of Fresno, Tulare & Kings Cos. - 1892 |
| Orme | H. S. | 231 | An Illustrated History of Los Angeles County - 1889 |
| Orme | H. S. | 797 | An Illustrated History of Southern California - 1890 |
| Orme | Henry S. (M. D.) | 57; Vol. II | History of Los Angeles and Environs - 1915 |
| Orme | Henry S. (M. D.) | 592 | History of Los Angeles and Vicinity - Guinn - 1901 |
| Ormiston | William C | 351 | History of Los Angeles and Vicinity - Guinn - 1901 |
| Ormsbee | M. D. | 439 | Biographical History of Northern California - 1891 - Ver. 2 |
| Ormsby | Martha P | 1227 | Biographical Record of the Sacramento Valley - 1906 |
| Ormsby | Waterman L. | 253 | Fresno County: The Pioneer Years to 1900- 1984 |
| Ormsby | J. H. | 694 | History of Sonoma County - 1880 |
| Ormsby | Waterman L. | 257 | Fresno County: The Pioneer Years to 1900- 1984 |
| Ormsby | Edwin S | 900; Vol. III | History of Los Angeles and Environs - 1915 |
| Ormsby | E. A | 95 | History of Alameda Co. - 1928 |
| Ormsby | C. L | 302 | History of Alameda Co. - 1928 |
| Ormsby | G. W. | 433 | Illustrated History of Sonoma County - 1889 |
| Ormsby | Dr. | 233 | History of Fresno, Tulare & Kings Cos. - 1892 |
| Ormsby | Lenora L. ROBINSON | 600 | History of Fresno, Tulare & Kings Cos. - 1892 |
| Ornbaun | William F | 880 | History of Mendoncino & Lake Counties - 1914 |
| Ornbaun | John Shipley | 727 | History of Mendoncino County - 1880 |
| Ornbaun | Ken | 101-Vol. 2 | Mendocino County Remembered: An Oral History - Vol. 1 & 2 |
| Ornbaun | Andrew Marion Jr. | 326 | History of Sonoma County - 1937 |
| Ornduff | Isaac | 872 | History of Solano & Napa - 1912 |
| Orognen | B. | 1424 | History of the San Joaquin Valley - 1905 |
| Orr | Samuel | 484 | Biographical History of Northern California - 1891 - Ver. 2 |
| Orr | Orestes | 119 | History of Ventura Co. - 1926 |
| Orr | William | 262 | Fresno County: The Pioneer Years to 1900- 1984 |
| Orr | William | 2495 - Vol. II | History of Fresno County - 1919 |
| Orr | William W | 1853 | History of South Coast Counties - 1907 |
| Orr | W. W. | 578 | An Illustrated History of Los Angeles County - 1889 |
| Orr | Thomas L | 381 | History of Sonoma County - 1911 |
| Orr | Silas | 959 | History of Sacramento County - 1923 |
| Orr | Samuel | 760 | History of Mendoncino & Lake Counties - 1914 |
| Orr | Samuel M | 1132 | Biographical Record of Coast Counties - 1904 - Ver. 2 |
| Orr | Samuel M | 760 | History of Mendoncino & Lake Counties - 1914 |
| Orr | Robert | 262 | Fresno County: The Pioneer Years to 1900- 1984 |
| Orr | Orestes (Hon.) | 215 | Historical and Biographical Record of So. Calif. - 1902 |
| Orr | Mary McFarland | 681 | History of Sacramento County - 1923 |
| Orr | G. P. | 363 | An Illustrated History of Southern California - 1890 |
| Orr | B. F. | 789 | An Illustrated History of Los Angeles County - 1889 |
| Orr | C. C. | 213 | History of Ventura Co. - 1926 |
| Orr | S | 658 | History of Mendoncino County - 1880 |
| Orr | Frank | 1465 | History of Kern County - 1914 |
| Orr | John J | 1227 | History of South Coast Counties - 1907 |
| Orr | H. F. | 129 | History of Ventura Co. - 1926 |
| Orr | J. R | 424 | History of Tulare Co. - 1926 |
| Orr | Jacob | 1219 | History of Stanislaus County - 1921 |
| Orr | James E | 1140 | Biographical Record of the Sacramento Valley - 1906 |
| Orr | James | 786 | An Illustrated History of Los Angeles County - 1889 |
| Orr | F. A. | V.ii-675 | The Bay of San Francisco - A History - 1892 |
| Orr | Urith Murray | 449 | History of Tulare & Kings Cos. - 1913 |
| Orr | Samuel | 59, 261 | History of Santa Clara County - 1922 |
| Orr | Elizabeth | 388 | Shenandoah Valley Area of Amador Co. - 1854-1904 |
| Orr | John | 388 | Shenandoah Valley Area of Amador Co. - 1854-1904 |
| Orr | A. R. | 192, 203, 204 | Pioneer Communities of Porterville, Vandalia and Porterville - 1983 |
| Orr | John | 236 | Pioneer Communities of Porterville, Vandalia and Porterville - 1983 |
| Orr | C. M | 288 | History of Alameda Co. - 1928 |
| Orr | Chauncey A | 2 #69 6/66 | Los Tulares: 1948 - 11/86 |
| Orr | Emeline | 77, Vol. 3 | History of the San Francisco Bay Region - 1924 |
| Orr | Emmeline | 175, Vol. 2 | History of the San Francisco Bay Region - 1924 |
| Orr | Horatio W (B) | 545 | History of Santa Clara County - 1922 |
| Orr | N. M. | 349 | An Illustrated History of San Joaquin County, California |
| Orr | George | 236 | Genocide & Vendetta: The Round Valley Wars |
| Orr | J. | 74 | The Way It Was - Tulare Co. - Mitchell - 1998 |
| Orr | B. F | 776 | History of Los Angeles and Vicinity - Guinn - 1901 |
| Orr | A. R. | 204 | History of Fresno, Tulare & Kings Cos. - 1892 |
| Orr | Mr. | 187 | History of Fresno, Tulare & Kings Cos. - 1892 |
| Orr | Ashley S | 178 | Tulare Community War Album - 1945 |
| Orr | E dgar R | 178 | Tulare Community War Album - 1945 |
| Orra | Frank | 416 | History of Alameda Co. - 1928 |
| Orreal | Louis (B) | 1358 | History of Santa Clara County - 1922 |
| Orrick | T. H. Jr. | 864 | History of Los Angeles Harbor District |
| Orrison | EMma Cochran | 730 | History of Tulare & Kings Cos. - 1913 |
| Orsmby | Alfred S | 421 | History of Contra Costa - 1926 |
| Ort | Otto V | 280 | History of Santa Cruz Co. - 1892 |
| Ort | Julius | 718 | Illustrated History of Sonoma County - 1889 |
| Ortega | J. F. | 248 | History of Ventura Co. - 1926 |
| Ortega | Juan D. | 1541 | History of Orange County - 1921 |
| Ortega | Victor | 717 | History of San Luis Obispo Co. and Environs- 1917 |
| Ortega | Juan Father | 39 | Fresno County: The Pioneer Years to 1900- 1984 |
| Ortega | John M. | 1522 | History of Orange County - 1921 |
| Ortega | E. C. | 111 | History of Ventura Co. - 1926 |
| Ortega | Juan | 2085 | History of South Coast Counties - 1907 |
| Ortega | Amelio | 362 | An Illustrated History of Southern California - 1890 |
| Ortega | J. C | 542 | Memorial & Biographical History of Santa Barbara, San Luis Obispo & Ventura Cos. - 1891 |
| Ortega | Quentin | 69 | History of Santa Clara County - 1922 |
| Ortega | Ignacio | 291 | History of Santa Clara County - 1922 |
| Ortega | Sergeant | 1 #5 3/50 | Los Tulares: 1948 - 11/86 |
| Ortega | Juan | 18 | The Way It Was - Tulare Co. - Mitchell - 1998 |
| Ortega | Leno | 115 | Orosi: In the beginning: 1888-1988 |
| Ortega | Raul | 115 | Orosi: In the beginning: 1888-1988 |
| Ortega | Joe | 115 | Orosi: In the beginning: 1888-1988 |
| Ortega | Albert | 115 | Orosi: In the beginning: 1888-1988 |
| Orth | Anna Baxley | 554 | History of Tulare & Kings Cos. - 1913 |
| Orth | George W. | 231, 233, 234 | History of Fresno, Tulare & Kings Cos. - 1892 |
| ORTIZ | Edward C. | 149 | Dinuba War Album - 1944 |
| ORTIZ | Mary R. Mrs | 149 | Dinuba War Album - 1944 |
| Ortiz | Albert | 133 | Tulare Community War Album - 1945 |
| Ortker | Fred M | 1070 | American Biography and Genealogy - California Edition - 1900? |
| Ortley | John J. | 566 | History of Santa Clara County - 1881 |
| Ortley | William B (B) | 837 | History of Santa Clara County - 1922 |
| Ortman | Josephine | 262, Vol. 2 | History of the San Francisco Bay Region - 1924 |
| Ortman | Charles L | 408 | History of San Joaquin Co. - 1923 |
| Orton | R | 623 | Memorial & Biographical History of Santa Barbara, San Luis Obispo & Ventura Cos. - 1891 |
| Orton | Thomas | 248 | History of Plumas, Lassen & Sierra Cos. - 1882 |
| Orton | R. H. | 561 | Illustrated History of Sacramento County - 1890 |
| Orton | Julius | 1423 | History of the San Joaquin Valley - 1905 |
| Orton | Chauncey S. | Vol. III - 236 | History of Orange County - 1931 |
| Orton | Chauncey S | 1499 | History of Orange County - 1921 |
| Orton | Robert | 584 | Historical and Biographical Record of So. Calif. - 1902 |
| Orton | Amelia A. Wright | 844 | History of Tulare & Kings Cos. - 1913 |
| Orton | Ozie Thomas | 500 | History of Tulare & Kings Cos. - 1913 |
| Orton | Julius | 80, 235 | Pioneer Communities of Porterville, Vandalia and Porterville - 1983 |
| Orton | A. E. | 347 | History of Alameda Co. - 1928 |
| Orton | Gene | 2 #46 12/60 | Los Tulares: 1948 - 11/86 |
| Orton | Julius | 29, 37, 39, 70, 72, 74 | The Way It Was - Tulare Co. - Mitchell - 1998 |
| Orvis | William Snow | 1449 | History of Stanislaus County - 1921 |
| Orvis | W. S. | 252 | History of Santa Clara County - 1922 |
| Orzalli | Margaret (Mrs.) | 696 | History of Placer & Nevada Cos. - 1924 |