- Abraham Anson papers, 1939/20056
- Alexander Haight family collection, 1764/19773
- American Political Items Collectors collection3
- American Public Transportation Association records, 1898/19997
- Arena Stage records, 1949/20106
- Arnold Sundgaard papers, 1925/198814
- Arthur E. Scott photograph collection4
- Arthur E. Scott photograph collection, 1910/19764
- Arthur Peterson papers1
- Broadway souvenir theatre programs collection, 1942/19971
- C-SPAN records, 1809/2012, bulk 1978/20122
- C. Harrison Mann, Jr. papers, 1832/19794
- Carol D. Litchfield microbiology collection1
- Carol R. Lubin papers, 1960/19812
- Charles Baptie photograph collection11