Columbia subject headings:
Coasts--United States.
Dredging--United States.
Harbors--United States--Maintenance and repair.
Harvard subject headings:
Coasts--United States
Dredging--United States.
Harbors--United States--Maintenance and repair.
Princeton subject headings:
Coasts--United States.
Dredging--United States.
Harbors--United States--Maintenance and repair.