APA (7th ed.) Citation

(1993). Digital elevation models (Third printing (revised) 1993.). [U.S. Geological Survey].

Chicago Style (17th ed.) Citation

Digital Elevation Models. Third printing (revised) 1993. Reston, Virginia: [U.S. Geological Survey], 1993.

MLA (9th ed.) Citation

Digital Elevation Models. Third printing (revised) 1993. [U.S. Geological Survey], 1993.

Warning: These citations may not always be 100% accurate.