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  1. 41
    Four new species of Chalcidoidea parasitic on cactus insects.
    Published 1936
    Electronic resource (PDF)
    Government Document eBook
  2. 42
    Mexican fossil Echini [sea urchins].
    Published 1937
    Electronic resource (PDF)
    Government Document eBook
  3. 43
    Species of foraminiferal family Camerinidae in tertiary and cretaceous of Mexico.
    Published 1939
    Electronic resource (PDF)
    Government Document eBook
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