- P-orridge, Genesis. 1950-2020. Artist file: miscellaneous uncatalogued material1
- P. A. Preston Letter, 18592
- P. Bradley & Sons Ledger, 1901/19033
- P. Burwell Rogers Papers, 1923/197862
- P. Geoffrey Feiss Papers, 2007/20102
- P. H. Garland Papers, 19392
- P. H. Woodward Letter, 18602
- P. Johnston Diary, 18742
- P. L. Kemble and Company ledger, 18662
- P. L. Williams and Company Ledger,
1906-19081
- P. Leigh Ledger, 1907/19082
- P. R. Page Diary, 1856/18612
- P. Seales Notebook, 18312
- P. T. Henshaw letter to his father, 18681
- P. Traynor letter, 18971