- P. Burwell Rogers Papers, 1923/197813
- Pabst School of Music records, 1924/19832
- Pace Family Papers, 1947/20063
- Page Milling Company daybooks, 1955/19603
- Painters Local Union, No. 91, Wheeling, Records, 1886/19582
- Pamela Webb Architectural Collection, 1950/20092
- Panoramic Photographs Collection, 1890/2008, bulk 1890/19601
- Papers of Christine Meadows, Curator, 1960/199730
- Papers of James Lawrence Basil Williams
ca.
1895-199514
- Papers of Marianne Moore
1928-19651
- Papers of Mark Twain
1862-1946, bulk 1872-19101
- Papers of Mary Johnston3
- Papers of Mary V. Thompson, Research Historian, 1980/20121
- Papers of Robert Frost
1873-198113
- Papers of Virginius Dabney
1902-198310