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1
by Rhodes, Daniel, 1911-1989
New York : Greenberg, 1957

Book
2
by O'Neill, Bernard J., 1920-
Harrisburg [Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey] 1965

Book
3
Harrisburg, Pa. Pennsylvania Geological Survey, 1915

Book
4
by Cuxart, Bernadette
Hauppage NY : Barron's, 2010
1st U.S. ed.

Book
5
by Russell, Solveig Paulson
Chicago : Rand McNally, 1963

Book
6
by Hosterman, John W. (John Wallace), 1923-
Washington : U.S. Govt. Print. Off, 1972

Government Document Book
7
by Barford, George
Worcester, Mass., Davis Publications 1963

Book
8
by Roen, John B.
Harrisburg : Pennsylvania Geological Survey, 1969

Book
9
by O'Neill, Bernard J., 1920-
Harrisburg [Pennsylvania Topographic and Geologic Survey], 1981

Book
10
by Mackenzie, Robert Cameron, 1920-2000
London : Mineralogical Society (Clay Minerals Group), 1957

Book
11
by Staubach, Suzanne
New York : Berkley Books, 2005
First edition.

Book
12
by Grim, Ralph E. (Ralph Early), 1902-1989
New York, McGraw-Hill, 1953

Book
13
by Grim, Ralph E. (Ralph Early), 1902-1989
New York, McGraw-Hill, 1962

Book
14
by Rhodes, Daniel, 1911-1989
Philadelphia, Chilton Book Co. 1973
[Rev. ed.].

Book
15
by Berensohn, Paulus
New York : Simon and Schuster, 1972

Book
16
by Clayton, Peirce
Asheville, N.C. : [New York] : Lark Books ; Distributed in the USA, Canada, the United Kingdom, Europe, and Asia by Random House, Inc., 1998
1st ed.

Book
17
by Norsker, Henrik
Braunschweig [Germany] : F. Vieweg, 1987

Book
18
by Moore, Duane Milton, 1933-
Oxford [England] ; New York : Oxford University Press, 1989

Book
19
by O'Neill, Bernard J., 1920-, Barnes, John Henry, 1946-
Harrisburg : Pennsylvania Geological Survey, 1979

Book
20
Harrisburg : [Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey], 1971

Book