Collection
- Norwalk, Ohio family photograph albums, ca. 1920s2
- Notes about Children in Teachers' Institute Note Book, [ca. 1890s]2
- Oberlin, Ohio Photograph Album, ca. 1860s-1900s2
- Olney Family Photograph Albums, ca. 1895-19102
- Olof Peter Ahlgren account book, 1855-1889 (majority within 1855-1881)2
- Ornithology studies, 18992
- Pageant of the Dunes Photograph Album, 1917-19182
- Painted Bulletin Advertising Association Book, 1923-19242
- Paul A. Meunier Photograph Albums, 1942-19492
- Pennsylvania Burial Removal permits, 1906-19092
- People Photographed While Reading Photograph Album, ca. 1870s-1900s2
- Peter A. Sickal diary, 1884-18862
- Pilsbury-Heath family letters, 1828-18542
- Polly C. Bishop Mansfield collection, [ca. 1850s]2
- Pöpplein & Brothers daybook and account ledger, 1806-18432
- R. A. L. Robinson atlas, 18312
- Rachel Ann White diary, 1834-18372
- Railroad Building in Québec Photograph Album, 1906-19092
- Rebecca M. Bradford letters, 1853-18572
- Rehoboth Beach, Mountain Island, Norfolk Photograph Album, ca. 1895-19052