| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Owls of North America, North of Mexico: All the Species and Subspecies Illustrated in Color and Fully Described | 978-O-385-O4818-7 (O-385-O4818-1) | 1974 | Allan W. Eckert |
"E. K." · K.k. · Karl E · Karl Karalus