The Moon held little interest for most scientists after its basic astronomic properties had been determined and before direct exploration appeared likely. Speculations about its internal structure, composition, and origin were only broadly constrained by cosmochemical data from meteorites and solar spectra, and by astronomic data about its size, shape, motions, and surficial properties. Most investigators who were active before the space age began in 1957 believed that significant new advances in lunar knowledge required acquisition of additional data..
The Geologic History of the Moon ebook
download The Geologic History of the Moon pdf free
The Geologic History of the Moon pdf free download
U.S. Department of the Interior ebooks downloads
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