Kategori:1801 anläggningar i Pennsylvania
Sidor i kategorin "1801 anläggningar i Pennsylvania"
C
Clinger-Moses Mill Complex
Covington Township, Tioga County, Pennsylvania
L
Loudoun Mansion
N
North Sewickley Township, Beaver County, Pennsylvania
O
Orwell Township, Bradford County, Pennsylvania
P
Philadelphia vattenavdelning
S
Susquehanna Township, Lycoming County, Pennsylvania
W
Williamsport Sun-Gazette