The Audubon Society field guide to North American butterflies / Robert Michael Pyle. Visual key by Carol Nehring and Jane Opper.
| Author/creator | Pyle, Robert Michael |
| Other author | National Audubon Society. |
| Format | Book |
| Publication Info | New York : Knopf, distributed by Random House, 1981. |
| Description | 916 pages : color illustrations ; 20 cm |
| Subjects |
| General note | Includes index. |
| Other title | North American butterflies. |
| LCCN | 80084240 |
| ISBN | 0394519140 |