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Some Costa Rican bees
Published in Transactions of The American Entomological Society Philadelphia, in 1906, in volume 32, pages 157-163
Created: 2012-08-13, modified: 2012-08-13
The Bees of New Mexico
Published in Transactions of The American Entomological Society, in 1906, in volume 32, pages 289-314
Created: 2013-04-05, modified: 2013-04-05