 | Thomas J. Allen - Nature - 1997 - 388 pages
Describes 128 species of butterflies found in the state, along with their caterpillars and pupae. Each species account provides a description and information on distribution ... | |
 | Paul R. Ehrlich - Nature - 1961 - 262 pages
Biological background for the study of butterflies precede an illustrated list of North American specimens and their characteristics | |
 | William H. Howe, David L. Bauer - Nature - 1975 - 633 pages
Provides information on the appearance, life histories, biology, and habitats of all butterflies and skippers in all fifty of the United States and in Canada | |
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