APA (7th ed.) Citation

Geological Survey (U.S.). (1950). States of Maryland and Delaware: Shaded relief. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). States of Maryland and Delaware: Shaded Relief. Washington, D.C.: The Survey, 1950.

MLA (9th ed.) Citation

Geological Survey (U.S.). States of Maryland and Delaware: Shaded Relief. The Survey, 1950.

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