Opler, Paul Alexander, Herbert George Baker and Gordon W.
Frankie
1975. Reproductive biology of some Costa Rican Cordia species (Boraginaceae). Biotropica 7(4): 234 247, 5 figs., 6 tabs. (December) [general; pollinators]
Opler, Paul Alexander, and George O. Krizek
1984. Butterflies East of the Great Plains. An illustrated natural history. Baltimore and London, The Johns Hopkins University Press. xvii + 294 pp., 54 pls., 38 figs., 11 tabs. [general; Neotropics]
Opler, Paul Alexander, and Vichai Malikul
1992. A field guide to Eastern butterflies. Boston, Houghton Mifflin Company. xix + 396 pp., 48 pls., 7 figs., maps. [general]
Opler, Paul Alexander, and Jerry Alan Powell
1962. Taxonomic and distributional studies of the Western components of the Apodemia mormo complex (Riodinidae). Journal of the Lepidopterists' Society 15(3): 145 171, 1 pl., 2 maps (21 March) [general; new subspecies: A. m. tuolumnensis, A. m. dialeuca; ecology; Mexico]
[1984]. Butterfly counts 1982 + 1983. Los Angeles, Xerces Society. 46 pp., 4 tabs., 1 map. [general; Mexico]
1987. Fourth of July butterfly counts. 1986 report. Atala 15(suppl.): 1-30, 1 tab. [general; Mexico]
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