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  1. 1
    by Lal, D. (Devendra), 1929-
    Published 1976
    Lucknow : Birbal Sahni Institute of Paleobotany, 1976.
    10 p., 8 p. of plates : ill. ; 25 cm.
  2. 2
    by Krupenio, Nikolaĭ Nikolaevich
    Published 1978
    Moskva : Nauka, 1978.
    183 p. : ill. ; 20 cm.

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