[en] [Gutenberg 55010] • Charlestown Navy Yard · Boston National Historical Park, Massachusetts National Park Service

[en] [Gutenberg 55414] • Grand Teton · A Guide to Grand Teton National Park, Wyoming National Park Service

[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 57935] • Vicksburg National Military Park, Mississippi National Park Service

[en] [Gutenberg 58588] • Petersburg National Military Park, Virginia National Park Service

[en] [Mysteries in Our National Parks 03] • Cliff-Hanger National Geographic Society

[en] [Mysteries in Our National Parks 12] • Buried Alive! National Geographic Society

[en] National Geographic Guide to National Parks of the United States National Geographic

[en] [Mysteries in Our National Parks 13] • Night of the Black Bear National Geographic Society

[en] [Mysteries in Our National Parks 01] • Wolf Stalker National Geographic Society

[en] [Mysteries in Our National Parks 06] • Ghost Horses National Geographic Society

[en] [Mysteries in Our National Parks 05] • The Hunted National Geographic Society

[en] [Mysteries in Our National Parks 08] • Valley of Death National Geographic Society

[en] [Mysteries in Our National Parks 10] • Out of the Deep National Geographic Society

[en] [Mysteries in Our National Parks 09] • Escape From Fear National Geographic Society

[en] [Mysteries in Our National Parks 04] • Deadly Waters National Geographic Society

[en] [Mysteries in Our National Parks 11] • Running Scared National Geographic Society

[en] [Mysteries in Our National Parks 07] • Over the Edge National Geographic Society

[en] [Gutenberg 62413] • Cowpens / Downright Fighting: The Story of Cowpens Interior Department, National Park Service