| Pennsylvania Academy of the Fine Arts. Matches 2 items |
| Pennsylvania Anti-Slavery Society. Matches 1 item |
| Pennsylvania. Antietam battlefield memorial commission. Matches 1 item |
| Pennsylvania Association of Intermediate Units. Matches 1 item |
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Pennsylvania. Biological Survey. SEE: Pennsylvania Biological Survey Matches 1 item
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| Pennsylvania Biological Survey. Matches 1 item |
| Pennsylvania Cable Network. Matches 1 item |
| Pennsylvania cavalry. 18th regiment (1862-1865) Matches 1 item |
| Pennsylvania cavalry. 3d regiment, 1861-1865. Matches 1 item |
| Pennsylvania (Colony). Committee of Safety, 1775-1776. Matches 1 item |