TY - BOOK AU - Opler, Paul A. AU - Malikul, Vichai AU - National Audubon Society AU - National Wildlife Federation AU - Roger Tory Peterson Institute TI - A field guide to eastern butterflies PB - Houghton Mifflin PY - 1992 T2 - The Peterson field guide series VL - 4 EP - xvii, 396 p. UR - https://ci.nii.ac.jp/ncid/BB1211801X SN - 039563279X ER -