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Aquatic and wetland plants of southwestern United States /
Published 1972Search for the full-text version of this title in HathiTrust
Government Document Book -
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Geographic variation in Myotis californicus in the southwestern United States and Mexico /
Published 1975Government Document Book -
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The principal Larrea bees of the southwestern United States (Hymenoptera, Apoidea) /
Published 1975Government Document Book -
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Description and development of the Cordilleran Orogenic Belt in the southwestern United States and northern Mexico /
Published 1991Government Document Book -
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Principal sunflower bees of North America with emphasis on the Southwestern United States (Hymenoptera, Apoidea) /
Published 1980Government Document Book