[en] [Gutenberg 55414] • Grand Teton · A Guide to Grand Teton National Park, Wyoming National Park Service
[en] [Gutenberg 59947] • Hubbell Trading Post National Historic Site: Junior Ranger Workbook Createspace Independent Publishing Platform
[en] [Gutenberg 62994] • Craters of the Moon / A Guide to Craters of the Moon National Monument, Idaho Interior Dept., National Park Service, Division of Publications
[en] [Gutenberg 55254] • Fort Sumter · Anvil of War / Fort Sumter National Monument, South Carolina National Park Service Division of Publications
[en] [Gutenberg 58587] • Devils Tower National Monument, Wyoming (1984) iOnlineShopping.com
[en] [Gutenberg 59748] • Devils Tower National Monument, Wyoming (1949) iOnlineShopping.com
[en] [Gutenberg 59692] • Petrified Forest National Monument (1953) iOnlineShopping.com