Mary Huston Gregory

United States. Department of the Interior

American Anti-Slavery Society

American National Red Cross

Landesverein Sächsischer Heimatschutz

Library of Congress. Copyright Office

Thomas K. Ford

United States. Congress

United States. Council of National Defense. Highways Transport Committee

United States. National Park Service

United States. War Department

United States. Warren Commission

United States. Work Projects Administration

Alexander von Humboldt

Herbert Newton Casson

John Wesley Powell

William T. Hornaday