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Druif Paul De, . (1926). Microbe hunters. New York, USA: Harcourt, Brace and Company.
Druif Paul De, . 1926. Microbe hunters. New York, USA: Harcourt, Brace and Company.
Druif Paul De, . Microbe hunters. New York, USA: Harcourt, Brace and Company. 1926.
