Cross-referenced research literature and technical manuals completely matching the keyword registry records for Outdoor Recreation.
The Complete Encyclopedia of Hunting Rifles Second edition by Hartink, A. E. (1997) Hardcover
Camper's Guide to Texas Parks, Lakes, and Forests: Where to Go and How to Get There
Woodall's Frontier West/Great Plains & Mountain Region Campground Guide, 2004
Biographical Dictionary of American Sports: Outdoor Sports
Guide to the Continental Divide Trail : Southern Colorado