TY  - BOOK
AU  - Opler,Paul A.
ED  - National Audubon Society.
ED  - National Wildlife Federation.
ED  - Roger Tory Peterson Institute.
TI  - A field guide to eastern butterflies
T2  - The Peterson field guide series
SN  - 039563279X (pbk.)
AV  - QL551.E16 O65 1992
PY  - 1992///
CY  - Boston
PB  - Houghton Mifflin
KW  - Butterflies
KW  - East (U.S.)
KW  - Mariposas
KW  - Este (U.S.A.)
KW  - Canadá
KW  - lemb
KW  - Greenland
N1  - "Sponsored by the National Audubon Society, the National Wildlife Federation, and the Roger Tory Peterson Institute."; Bibliografía (p. 359-362) e indice
ER  -