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43
by Roberts, Joseph Kent, 1889-
Lexington : University of Kentucky, 1950

Book
44
by Lang, William Dickson, b. 1878
London, Printed by order of the Trustees of the British museum, 1940

Book
45
by Johnson, Edward A. (Edward Allison), 1940-
[Ann Arbor, Mich. : University Microfilms, 1975

Thesis Book
47
Beijing : Ke xue chu ban she, 1974

Book
48
by Eberlein, G. Donald, 1920-
Washington, U.S. Govt. Print. Off., 1970

Book
49
by Smith, J. Fred (Joe Fred), 1911-1982
Washington : U.S. Govt. Print. Off., 1975

Government Document Book
51
[Ottawa, Ont.] : Energy, Mines and Resources Canada : Geological Survey of Canada [distributor], 1995

Book
52
Harrisburg, Pa. : Pub. by the Board of commissioners for the Geological Survey, 1892

Book
53
by Wrucke, Chester T., 1927-
Washington : U.S. Govt. Print. Office, 1961

Government Document Book
54
by Stensiö, Erik Andersson, 1891-
London, Printed by order of the Trustees of the British Museum, 1932

Book
56
[Beijing] : Di zhi chu ban she, 1976
[1st ed.]

Book
57
by Schuchert, Charles, 1858-1942
New Haven, Conn. [Tuttle, Morehouse & Taylor Co.] 1932

Book
58
Washington, D.C. : U.S. G.P.O., 1998

Government Document Book
59
by Clifford, Tom N.
New York [Geological Society of America] 1967

Book
60
by Grabau, Amadeus W. (Amadeus William), 1870-1946
[Peiping] University Press, the National University of Peking, 1936

Book