Columbia subject headings:
Atlantic Coast (U.S.)--Surveys.
Long Island Sound (N.Y. and Conn.)--Surveys.
Virginia--Surveys.
Harvard subject headings:
Atlantic Coast (U.S.)--Surveys.
Fortification--United States
Hydrographic surveying--United States.
United States. Navy--Facilities.
Princeton subject headings:
Atlantic Coast (U.S.)--Surveys.
Long Island Sound (N.Y. and Conn.)--Surveys.
Virginia--Surveys.