Geological map of Maryland on which are also shewn the chief topographical features to aid in the triangulation.

Scale 1:200,000.
Manuscript; pen-and-ink.
Relief shown by contours.
Geologic information not shown.
Shows only Washington, Frederick, Carroll, Montgomery, Howard, Prince Georges, Anne Arundel, Charles, Calvert, and St. Mary Counties.
Includes text on "Materials employed."
Available also through the Library of Congress Web site as a raster image.
Vault
AACR2