Butterflies : A handbook of the butterflies of the United States, complete for the region North of the potomac and Ohio rivers a - Ralph W. Macy; Harold H. Shepard (Minneapolis University of Minnesota Press, 1941)
Ralph W. Macy & Harold H. Shepard: Butterflies : A handbook of the butterflies of the United States, complete for the region North of the potomac and Ohio rivers and East of the Dakotas. Minneapolis. University of Minnesota Press, 1941.--(595.789MAC)
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