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Department of the Interior, National Park Service: Control of Elk Population, Yellowstone National Park
United States. Congress. Senate. Committee on Appropriations
其他書名
Hearings Before a Subcommittee, Ninetieth Congress, First Session
出版U.S. Government Printing Office, 1967
URLhttp://books.google.com.hk/books?id=JRQ3AQAAIAAJ&hl=&source=gbs_api
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