| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Birding by Ear: Eastern/Central | 978-0-618-22590-3 | 2002 | Robert W. Lawson |
| Birds of the Sudbury River Valley: An historical perspective | 978-0-932691-00-2 | 1984 | |
| Common Butterflies of the Southeast | 978-1-888814-03-3 | 1998 | Greg Dodge |
| More Birding by Ear: A Guide to Bird-Song Identification: Eastern/Central | 978-0-395-71259-7 | 1994 | Robert W. Lawson |
| More Birding by Ear: Eastern/Central | 978-0-618-22592-7 | 2000 | " |
| National Audubon Society Pocket Guide to Waterfowl | 978-0-679-74924-0 | 1994 | National Audubon Society |
| Western Birding by Ear | 978-0-395-97525-1 | 1999 | Robert W. Lawson |
K. W. · K. Walton · R.K. · R Walton · Richard W. · Richard Walton
Brownbag Productions · HOUGHTON MIFFLIN · Houghton Mifflin · Massachusetts Audubon Society · Random House