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1
by Herrera, Wilberth
Costa Rica : Incafo, S.A., 1992

Book
2
by Dickerson, Richard Earl, 1931-, Geis, Irving
New York, Harper & Row 1969

Book
3
by Hoffman, Roger A. (Roger Alan), 1924-
Ames : Iowa State University Press, 1968
[1st ed.].

Book
4
by Mayr, Ernst, 1904-2005
Cambridge, Mass., Belknap Press of Harvard University Press, 1970

Book
5
by Simpson, Brian
Oxford, New York, Pergamon Press 1968
[1st ed.].

Book
6
[Harrisburg?] Published by the Geological Survey of Pennsylvania. 1891

Map
7
[Augusta, ME] : Maine Geological Survey, Dept. of Conservation, 1988

Book
8
by Morton, Oliver
New York : Picador, 2002
First U.S. edition.

Book
9
by Price, Jeff
London ; San Diego : Academic Press, 1995

Book
10
New York, Reinhold, 1956

Book
11
Harrisburg, Board of Commissioners for the Geological Survey, 1892

Book
12
by Carswell, Louis D.
Harrisburg [Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1963

Government Document Book
13
New York : Oxford University Press, 1990

Book
14
by Miller, J. T. (John T.), 1906-
Harrisburg : Dept. of Internal Affairs, Topographic and Geologic Survey, 1961

Book
15
New York : H. Holt, 1996
First edition.

Book
16
by Poth, Charles W.
Harrisburg [Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1963

Government Document Book
17
by Brandt, John C.
Boulder, CO : University of Colorado-Boulder, Laboratory for Atmospheric and Space Physics, 1992

Book
18
by Butler, B. C. M., 1932-
Harlow, Essex, England : New York : Longman Scientific & Technical ; Wiley, 1988

Book
19
by Montgomery, Scott L.
Tucson : University of Arizona Press, 1999

Book
20
by Dodge, Clifford H.
[Harrisburg] : [Pennsylvania Geological Survey], 2005

Government Document Book