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  1. 1
    出版 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
    出版 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
    出版 1990
    Kuopio : University of Kuopio, Dept. of Physics, 1990.
    [150] s. : kuv. ; 25 cm.
    “...Publications of the University of Kuopio. Natural sciences. Original reports,...”
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