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Popov Yu.M. (1961). Триасовые аммоноидеи северо-востока СССР [= The Triassic Ammonoidea of the north-east of the USSR]. Moscow: Gosgeoltekhizdat. 179 pp.
Popov Yu.M. (1961). Триасовые аммоноидеи северо-востока СССР [= The Triassic Ammonoidea of the north-east of the USSR]. Moscow: Gosgeoltekhizdat. 179 pp.
