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1
Greater Pittsburgh region construction aggregates /
by O'Neill, Bernard J., 1920-
Harrisburg : Pennsylvania Geological Survey, 1974

Map
2
Greater Pittsburgh region construction aggregates /
by O'Neill, Bernard J., 1920-
Harrisburg : Pennsylvania Geological Survey, 1974

Book
3
Greater Pittsburgh region construction aggregates /
by O'Neill, Bernard J., 1920-
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geologic Survey, 1974

Government Document Book
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