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  1. 1
    Published 1969
    [Washington, D. C.] : Springfield, Va. : National Aeronautics and Space Administration ; for sale by the Clearinghouse for Federal Scientific and Technical Information, 1969.
    v, 62 p. : ill. ; 27 cm.
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  2. 2
    Published 1969
    [Washington, D. C.] : Springfield, Va. : National Aeronautics and Space Administration ; for sale by the Clearinghouse for Federal Scientific and Technical Information, 1969.
    55 p. : ill. ; 27 cm.
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  3. 3
    by Rankama, Kalervo
    Published 1944
    Helsinki : Government Press, 1944.
    78 p. : ill. ; 25 cm.
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  4. 4
    by Geis, Theo
    Published 1961
    Washington, D.C. : National Aeronautics and Space Administration, 1961.
    92 p. : ill. ; 28 cm.
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