World beneath the sea /
by James Dugan ... [et al.] ; foreword by Gilbert M. Grosvenor.
- Washington, DC : National Geographic Society, c1967.
- 204 p. : col. ill.
- National Geographic books, 2nd ser., v.2 .
Includes index.
Underwater exploration
Oceanography--Popular works
Includes index.
Underwater exploration
Oceanography--Popular works