Relief shown by contours, isolines and spot heights.
Contour interval on land 10 feet; contours off shore at depths of 5, 10, and 20 feet.
Surveyed in 1917, in cooperation with the War Department.
Text and ill. on verso.
R.B. Marshall, chief geographer; W.H. Herron, geographer in charge; topography by W.H. Griffin [and others].