Não informado. (1930). Program of activities of the Chicago Academy of Sciences. Chicago Academy of Sciences.
Citace podle Chicago (17th ed.)Não informado. Program of Activities of the Chicago Academy of Sciences. Chicago, Ill: Chicago Academy of Sciences, 1930.
Citace podle MLA (8th ed.)Não informado. Program of Activities of the Chicago Academy of Sciences. Chicago Academy of Sciences, 1930.
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