Symbols used on topographic quadrangle maps produced by the U.S. Geological Survey.
Control data and monuments
Mines and caves
Glaciers and permanent snowfields
Submerged areas and bogs
Rivers, lakes, and canals
Buildings and related features
Roads and related features
Roads on Provisional edition maps are not classified as primary, secondary, or light duty. They are all symbolized as light duty roads.
Railroads and related features
Transmission lines and pipelines
Produced by the U.S. Geological Survey.