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Results of the Second U. S. Manned Suborbital Space Flight, July 21, 1961

United States. National Aeronautics and Space Administration. Manned Spacecraft Center

出版	U.S. Government Printing Office, 1961
URL	http://books.google.com.hk/books?id=whYaEbHgekYC&hl=&source=gbs_api