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Exploring the Unknown
John M. Logsdon
其他書名
Selected Documents in the History of the U.S. Civil Space Program
出版NASA, 1995
ISBN01606184959780160618499
URLhttp://books.google.com.hk/books?id=vV4mqxI5fJUC&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN