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  1. 1
    Moskva : Izd-vo Akademii nauk SSSR, 1940.
    157 p. : ill. ; 27 cm.
  2. 2
    by Lantto, Heikki
    Published 1977
    Helsinki : [Finnish Academy of Technical Sciences], 1977.
    18 p. : ill. ; 25 cm.

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