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21
Geology and mineral resources of the Washingtonville and Millvale quadrangles : Montour, Columbia, and Northumberland counties, Pennsylvania /
Harrisburg, Pa. : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Office of Parks and Forestry, Bureau of Topographic and Geologic Survey, 1993

Government Document Book
22
Landslides in Pennsylvania /
by Delano, Helen L.
Harrisburg, Pa. : Pennsylvania Geological Survey, 2001
2nd ed.

Government Document Book
23
Moraine and McConnells Mill State Parks, Butler and Lawrence Counties : glacial lakes and drainage changes /
[Harrisburg, Pa.] : Pennsylvania Department of Conservation and Natural Resources, 2003

Government Document Book
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