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Government Document
Book
3
by Geyer, Alan R.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1982
2d ed., revised, 1982.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1982
2d ed., revised, 1982.
Government Document
Book
4
6
7
9
by Wilshusen, John P.
[Harrisburg] : [Pennsylvania Dept. of Environmental Resources], 1979
[Harrisburg] : [Pennsylvania Dept. of Environmental Resources], 1979
Government Document
Book
10
by Delano, Helen L.
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geologic Survey, 1999
4th series.
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geologic Survey, 1999
4th series.
Government Document
Book
11
by Geyer, Alan R.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1982
2d ed., revised, 1982.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1982
2d ed., revised, 1982.
Government Document
Book
12
by Wilshusen, John P.
Harrisburg, Pa. : Commonwealth of Pennsylvania [Dept. of Environmental Resources, Office of Resources Management, Bureau of Topographic and Geologic Survey], 1983
Harrisburg, Pa. : Commonwealth of Pennsylvania [Dept. of Environmental Resources, Office of Resources Management, Bureau of Topographic and Geologic Survey], 1983
Book