NORTH AMERICA
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Burch, J. B.. 1988. North American Freshwater snails: Introduction, Systematics, Identification, Morphology, Habitats, and Distribution. . 80 p.
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Kartesz, J. 1990. Synonymized checklist of the vascular flora [of North America north of Mexico, and Hawaii]. Unpublished second review draft.
Flora of North America Editorial Committee. 1993a. Flora of North America north of Mexico. Vol. 2. Pteridophytes and gymnosperms. Oxford Univ. Press, New York. xvi + 475 pp.
Burch, J. B and J. L. Tottenham. 1980. North American Freshwater snails: Species list, Ranges, and Illustrations. . 135 p.
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Flora of North America Editorial Committee. 1993b. Flora of North America north of Mexico. Vol. 1. Introduction. Oxford Univ. Press, New York.
Opler, P., Research associate, and A.D. Warrren. 2002. Butterflies of North America 2. Scientific names list for butterfly species of North America, north of Mexico. . 79 p.