APA (7th ed.) Citation

Geological Survey (U.S.). (1975). States of Maryland and Delaware. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). States of Maryland and Delaware. Reston, Va.: The Survey, 1975.

MLA (9th ed.) Citation

Geological Survey (U.S.). States of Maryland and Delaware. The Survey, 1975.

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