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1Published 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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2Published 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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3Published 1990Kuopio : University of Kuopio, Dept. of Physics, 1990.[150] s. : kuv. ; 25 cm.“...Publications of the University of Kuopio. Natural sciences. Original reports,...”