Underground worlds
By: by Donald Dale Jackson and the editors of Time-Life Books.
Contributors: Time-Life Books.
Series: Planet earth ;; 6
Publisher: Time-Life Books
Published: 1982
Place of publication: Alexandria, Va
Language: eng
Number of pages: 176
Subjects: Caving -- History -- 19th century.; Caving -- History -- 20th century.; Caves.
Notes: Bibliography: p. 170-172.
Includes index.