Columbia subject headings:
National security--United States.
Navigation--Safety measures.
Shipping--Security measures--United States.
United States. Coast Guard--Appropriations and expenditures.
United States. Federal Maritime Commission--Appropriations and expenditures.
Harvard subject headings:
National security--United States
Navigation--Safety measures
Shipping--Security measures--United States
United States. Coast Guard--Appropriations and expenditures.
United States. Federal Maritime Commission--Appropriations and expenditures.
Princeton subject headings:
National security--United States.
Navigation--Safety measures.
Shipping--Security measures--United States.
United States. Coast Guard--Appropriations and expenditures.
United States. Federal Maritime Commission--Appropriations and expenditures.