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Contributions to a History of American State Geological and Natural History Surveys
George Perkins Merrill
出版U.S. Government Printing Office, 1920
ISBN04051045029780405104503
URLhttp://books.google.com.hk/books?id=ZJuhW0r4GVYC&hl=&source=gbs_api
註釋George P. Merrill edited and compiled the list of State entries for natural history surveys and/or geological surveys for the individual States. Geological surveys may include references are non-uniform and sporadic by State. The omission of a State or Territory indicates that no public survey of the locality was undertaken during the period covered by this history. The subject matter is arranged alphabetically by States.