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| Oshkosh: Past and Present | Oshkosh Rotary Club | 1. Oshkosh (Wis.)-History-Pictorial works. 2. Oshkosh Rotary Club-Wisconsin | R 977.5 Winn Os4 | |
| Oshkosh State Teachers College, Oshkosh, Wisconsin, The Quiver, 1949 | Oshkosh State Teachers College | 1. Colleges and universities-Wisconsin-Oshkosh-Yearbooks. 2. Oshkosh State Teachers College (Wis.)-Students. I. Title. | R 378 Os4 1949 | |
| Oshkosh State Teachers College, Oshkosh, Wisconsin, The Quiver, 1948 | Oshkosh State Teachers College | 1. Colleges and universities-Wisconsin-Oshkosh-Yearbooks. 2. Oshkosh State Teachers College (Wis.)-Students. I. Title. | R 378 Os4 1948 | |
| Oshkosh High School: Index of 1928 Revue of the Year, Volume 37 | Oshkosh High School Students | 1. Oshkosh (Wis.)-Students. 2. Winnebago County (Wis.)-Students. 3. Schools-Wisconsin. I. Title. | R 371 Os4 1928 | |
| Ordnance Survey, The Complete Road Atlas of Ireland, Scale 1:210 000 | Ordinance Survey | 1. Ireland-Atlases. | R 912.415 Or2 | |
| Ordnance Survey, Motoring Atlas of Great Britain | Ordnance Survey | 1. Atlases-Great Britain. 2. Great Britain-Atlases. I. Title. | R 912.42 Or2 os | |
| Oral History: An Introduction for Students | Hoopes, James | 1. Oral History. I. Title. | R 907 H76 | |
| Oral History for the Local Historical Society, Second Edition, Revised | Baum, Willa K. | 1. Oral History. I. Title. | R 907 B32 | |
| Oostburg High School, Oostburg, Wisconsin, Sauk Trail, 1950 | the Senior Class | 1. Oostburg (Wis.)-Students. 2. Sheboygan County (Wis.)-Students. 3. Schools-Wisconsin. | R 371 On9 1950 | |
| One Room Schools of Jefferson County Index | Mielke, Ellinore | I. Mielke, Ellinore | R 371 On2 Index | |
| One Room Schools of Jefferson County | Johnson Creek Historical Society, compiler | 1. Schools-Wisconsin-Jefferson County (Wis.). 2. Students-Wisconsin-Jefferson County. | R 371 On2 | |
| One Room Country Schools, History and Recollections from Wisconsin | Jerry W. Apps | 1. Rural Schools-Wisconsin-History. | R 371 W75 | |
| One Hundred Years of Grace, 1852-1952, Through a Century of Christ, St. John's Lutheran Church, Watertown, Wisconsin | - | 1. St. John's Ev. Lutheran Church, Watertown (Wis.)-Chruch History. 2. Jefferson Coutny (Wis.)-Church History. | R 280 Wis Jeff Wtrtn StJ62 100 | |
| One Hundred and Twenty-Fifth Anniversary, 1837-1962, Whitewater, June 30-July 1, 2, 3, 4, 1962 | Whitewater Historical Society | 1. Whitewater (Wis.)-History. I. Whitewater Historical Society (Whitewater, Wis.). | R 977.5 Walw W58o | |
| One Cubit of Stature: A Story of the Order of Teutonic Knights | Gruenwald, Myron E | 1. Teutonic Knights. 2. Knights and knighthood. I. Title. II. Order of Teutonic Knights. | R 929.71 G92 | |
| Once Upon a Prairie: Reflections of Waukesha's Yesterdays | Koenig, G.H. | 1. Waukesha (Wis.)-History, 1834-1984. 2. Waukesha (Wis.)-Biography. I. Title. | R 977.5 Wauk K81 | |
| Olsen Funeral Home, Jefferson County, Wisconsin: Burial Records 1898-1900 and Burial Records October 19, 1903 thru November 30, 1910 | | 1. Jefferson County (Wis.)-Death and burial. 2. Olsen Funeral Home. | R 929.3 Jeff O18 | |
| Old World Wisconsin: Around Europe in the Badger State | Holmes, Fred L., illustrated with photos and sketches by Max Fernekes | 1. Wisconsin-Foreign population. I. Title. | R 301.45 H73 | |
| Old St. Mary's Catholic Church & The Cathedral of St. Peter the Apostle, Milwaukee, Wisconsin: Some marriage records 1847-1851, 1840-1849 | | 1. Old St. Mary's Catholic Church, Milwaukee (Wis.)Church records and registers. 2. The Cathedral of St. Peter the Apostle, Milwaukee (Wis.)-Church records and registers. 3. Milwaukee County (Wis.)-Ch | R 929.3 Milw Ol1 | |
| Old Soldiers' Home, A History and Necrology of the Northwestern Branch National Home for Disabled Volunteer Soldiers, Wauwatosa, Wisconsin, 1864-1900 | Jerger, Jeanette L., Dr | 1. Veterans, Disabled-Wisconsin. 2. National Home for Disabled Volunteer Soldiers. I. Title. | R 355.1 J47 | |
