TY  - SER
AU  - Powell,Jerry A.
AU  - Opler,Paul A.
TI  - Butterfly counts
AV  - QL549 .B87
U1  - 595.789 19
CY  - [S.l.]
PB  - The Society
KW  - Borboleta
N1  - Caption titles include: Xerces Society butterfly count, and Xerces butterfly count; Editors: <1982/83-, 1984> Paul A. Opler, Jerry A. Powell; Count is taken annually, June/July
ER  -