Directory of the nonfuel-mineral producers in Pennsylvania /

by Barnes, John Henry, 1946-
Harrisburg [Pa.] : Pennsylvania Aggregates and Concrete Association, 1997

Directory of the nonfuel-mineral producers in Pennsylvania /

by Barnes, John Henry, 1946-
Harrisburg, [Pa.] : Pennsylvania Aggregates and Concrete Association, 1997

Directory of the mineral industry in Pennsylvania /

by O'Neill, Bernard J., 1920-
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geologic Survey, 1977
3rd ed.

Directory of the mineral industry in Pennsylvania /

by Hoover, Karl V. (Karl Victor)
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1971
2nd ed.

Directory of the nonfuel-mineral producers in Pennsylvania /

by Berkheiser, Samuel W.
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1985
4th ed.

Directory of the nonfuel-mineral producers in Pennsylvania.

Harrisburg : Pennsylvania Geological Survey, 1985

Directory of the nonfuel-mineral producers in Pennsylvania /

by Berkheiser, Samuel W.
Harrisburg : Bureau of Topographic and Geologic Survey, 1985
4th ed.