L. S. · L. Sylvester · Leander S. Keyser · S.K.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Birds of the Rockies: With Eight Full-Page Plates by Louis Agassiz Fuertes; Many Illustrations in the Text by Bruce Horsfall, and ... a Complete Checklist of Colorado Birds | 978-1-4297-9824-2 (1-4297-9824-6) | 2009 |
| News From the Birds: -1898 | 978-1-112-22013-5 (1-112-22013-5) | 2009 |
| Our Bird Comrades | 978-1-112-00436-0 (1-112-00436-X) | 2009 |