H.N. · H-O. · H. Opperman · Hal Opperman
Amer Birding Assn · University of Washington Press
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| A Birder's Guide to Washington | 978-1-878788-20-7 (1-878788-20-5) | 2003 | |
| J.B. Oudry 1686-1755 | 978-0-295-96014-2 (0-295-96014-0) | 1983 | Hal Opperman |