Seranggapedia

 Murawski, Darlyne; Honovich, Nancy;

Washington : National Geographic Society , 2013

Lewis and Clark : voyages of discovery

 Ambrose, Stephen E.; Abell, Sam;

[Amerika] : National Geographic Society , 2002

National Geographic student ATLAS of the world

 National Geographic;

Washington, D.C. : National Geographic Society, , 2001

An American idea : the making of the national parks

 Heacox, Kim;

Washington : National Geographic Society, , 2009