Halka Chronic

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1. David D. Alt

   Author of Roadside Geology of Oregon, Roadside Geology of Northern California (Roadside Geology Series), Roadside Geology of the Northern Rockies

2. Halka Chronic

   Author of Roadside Geology of Colorado (Roadside Geology Series), Roadside Geology of Arizona, Roadside Geology of New Mexico (Roadside Geology Series)

3. John McPhee

   Author of Encounters with the Archdruid, Assembling California, Rising From The Plains

4. DeLorme Publishing

   Author of Colorado Atlas & Gazetteer, Utah Atlas & Gazetteer, Wyoming Atlas & Gazetteer

5. Marshall Trimble

   Author of Roadside History of Arizona (Roadside History Series)

6. David Lageson

   Author of Roadside Geology of Wyoming (Roadside Geology Series)

7. Wallace Stegner

   Author of Beyond the Hundredth Meridian: John Wesley Powell and the Second Opening of the West, Mormon Country, The Gathering of Zion: The Story of the Mormon Trail

8. Richard M. Pearl

   Author of Colorado gem trails and mineral guide

9. G. K. Guennel

   Author of Guide to Colorado Wildflowers: Plains and Foothills (Guide to Colorado Wildflowers)

10. Ralph Lee Hopkins

    Author of Hiking Colorado's Geology (Hiking Geology)

11. Melinda Crow

    Author of Rockhounds Guide to New Mexico (Falcon Guide)

12. William J. Fritz

    Author of Roadside Geology of the Yellowstone Country (Roadside Geology Series)

13. Bradford B. Van Diver

    Author of Roadside Geology of New York (Roadside Geology Series) (Roadside Geology Series), Roadside Geology of Vermont and New Hampshire

14. Robert P. Sharp

    Author of Geology Underfoot in Death Valley and Owens Valley, Geology Underfoot in Southern California

15. Wendell A. Duffield

    Author of Volcanoes of Northern Arizona: Sleeping Giants of the Grand Canyon Region (Grand Canyon Association)

16. Henry Pickering Walker

    Author of Historical Atlas of Arizona

17. Roger Tory Peterson

    Author of Western Birds (Peterson Field Guides), Mexican Birds (Peterson Field Guides)

18. James McTighe

    Author of Roadside History of Colorado

19. National Audubon Society

    Author of National Audubon Society Field Guide to North American Insects and Spiders, National Audubon Society Field Guide to North American Rocks and Minerals

20. Stephen M. Voynick

    Author of Colorado Rockhounding: A Guide to Minerals, Gemstones, and Fossils (Rock Collecting)