Collection
- Brown and Fox Family Photograph Albums, ca. 1915-19202
- Bulia (Brig) Vice-Admiralty Court documents, 18102
- C. C. Bristol collection, 1865-18702
- C. F. Lyman, 615 Books manuscript, [circa 1840s]2
- Camp Wihakowi Photograph Albums, 1923-19262
- Caspar F. Goodrich papers, 1869-192539
- Celebrity portraits scrapbook, ca. 1880s2
- Charles Grant, vicomte de Vaux papers, 1756-18058
- Charles H. F. Daigneault and Ren W. Philbrick drawing book, 1901-1905 (bulk 1904)2
- Charles H. Lund collection, 1870-18876
- Charles H. Marias Photograph Album, 1907-19082
- Charles Townshend papers, 1660-1804 (majority within 1748-1767)105
- Charles and Richard Alden scrapbooks, 1885-18932
- Christopher Hughes papers, 1801-1908 (majority within 1814-1884)35
- City of Glasgow (Steamship) collection, 1850-18523
- Clair Brubaker manuscript newspaper, The Victor Gazette, [circa 1917]2
- Clinton Prison, Lake Chazy, and Lake Saranac Photograph Album, 18972
- Club Room Gazette manuscript magazine, 186114
- Colorado, New Mexico, and Mexico Views Collection, ca. 1885-19152
- Cora Clarke papers, 1862-18812