1.

図書
図書
1. The geological evolution of North America : a regional approach to historical geology
Thomas H. Clark and Colin W. Stearn
出版情報: New York : Ronald Press, c1960
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2.

図書
図書
2. Index fossils of North America : a new work based on the complete revision and reillustration of Grabau and Shimer's "North American index fossils"
by Hervey W. Shimer and Robert R. Shrock
出版情報: New York : J. Wiley & Sons, inc. , London : Chapman & Hall, limited, c1944
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