Donald W. Hamer Center for Maps & Geospatial Infor:
State College, PA 1922
Donald W. Hamer Center for Maps & Geospatial Infor:
Patton, PA 1903
Donald W. Hamer Center for Maps & Geospatial Infor:
Congested District Philadelphia, PA 1916
Donald W. Hamer Center for Maps & Geospatial Infor:
Philadelphia, PA 1920 Map Cover
Donald W. Hamer Center for Maps & Geospatial Infor:
Kittanning, PA 1908
Donald W. Hamer Center for Maps & Geospatial Infor:
Great-Bend, PA 1885