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African bees of the genus Gronoceras. American Museum novitates ; no.774

Cockerell, Theodore D. A. (Theodore Dru Alison), 1866-1948.; Lang, Herbert, 1879-1957.; Chapin, James Paul, 1889-1964.; American Museum Congo Expedition (1909-1915) (New York City : The American Museum of Natural History, 1935)
Bees of the genus Megachile from the Belgian Congo. American Museum novitates ; no.783

Cockerell, Theodore D. A. (Theodore Dru Alison), 1866-1948.; Lang, Herbert, 1879-1957.; Chapin, James Paul, 1889-1964.; American Museum Congo Expedition (1909-1915) (New York City : The American Museum of Natural History, 1935)
Parasitic bees of the genus Coelioxys from the Belgian Congo. American Museum novitates ; no.808

Cockerell, Theodore D. A. (Theodore Dru Alison), 1866-1948.; Lang, Herbert, 1879-1957.; Chapin, James Paul, 1889-1964.; American Museum Congo Expedition (1909-1915) (New York City : The American Museum of Natural History, 1935)