Georg Oesterdiekhoff · Georg Ostermaier · Georg Ostrogorsky · George & Rhonda Ostertag · Rhonda and George Ostertag
Motorbooks · Mountaineers Books
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| 75 Hikes in the Oregon's Coast Range and Siskiyous | 978-0-89886-620-9 | 2001 | Rhonda Ostertag |
| California State Parks: A Complete Recreation Guide | 978-0-89886-762-6 | 2001 | " |
| Hiking New York, 2nd | 978-0-7627-2242-6 | 2002 | " |
| Hiking Pennsylvania, Second Edition | 978-0-7627-2244-0 | 2002 | " |
| Our Washington | 978-0-7603-2920-7 | 2008 | " |