Mysteries of mankind
Subtitle: Earth's unexplained landmarks
By: prepared by the Book Division, National Geographic Society.
Contributors: National Geographic Society (U.S.). Book Division.
Publisher: The Society
Published: 1992
Place of publication: Washington, D.C
Language: eng
Number of pages: 200
Subjects: Megalithic monuments; Earthworks (Archaeology); Sacred space
Notes: Includes bibliographical references (p. 197) and index.