The National geographic magazine.

Washington, D.C. : National Geographic Society, 1888-1959.
Umfang/Format: 116 v. : ill. (part col.) ports., maps (part fold., part col.) ; 26 cm.

National geographic.

Washington, D.C. : National Geographic Society, 1959-.
Umfang/Format: v. : ill. (some col.), ports., maps (some fold., some col.) ; 26 cm.
Umfang/Format: Issued also on microfilm by University Microfilms.