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Ornithological investigations in eastern Guatemala /
(The University of Oklahoma., 1960)
The phylogeny of American land snails with emphasis on the Polygyridae, Arionidae and Amonitellidae /
(The University of Oklahoma., 1960)
The comparative ecology of the kinosternid turtles of Oklahoma /
(The University of Oklahoma., 1960)
The avifauna of the Soloma region in Huehuetenango, Guatemala /
(The University of Oklahoma., 1960)
The avifauna of southeastern Coahuila, Mexico /
(The University of Oklahoma., 1960)