APA (7th ed.) Citation

Geological Survey (U.S.). (1994). Index to digital line graphs (DLG) from 1: 24,000-scale maps and digital elevation model (DEM) data. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Index to Digital Line Graphs (DLG) from 1: 24,000-scale Maps and Digital Elevation Model (DEM) Data. Reston, VA: The Survey, 1994.

MLA (9th ed.) Citation

Geological Survey (U.S.). Index to Digital Line Graphs (DLG) from 1: 24,000-scale Maps and Digital Elevation Model (DEM) Data. The Survey, 1994.