- A farkas árnyéka (2017)
- A Jaguár árnyéka (2018)
- A medve árnyéka (2019)
- A róka árnyéka (2021)
- A griff árnyéka (2023)
Non-fiction:
- The Making of a Ranger:A Memoir of a National Park Ranger (1995)
- The Ranger Within:Exploring the National Park System with America's Best-Known Ranger (1998)
- The Ranger's Guide to the National Parks:The Official Guide to America's 59 National Parks (2004)
- The Great Smoky Mountains:A Natural History Guide (2007)
- The Yellowstone Reader (2011)
- The Grand Canyon:A Natural History Guide (2014)
- Yosemite Nemzeti Park:Természettudományi kalauz (2017)