Columbia subject headings:
Automobiles--Rollover protective structures--United States.
Automobiles--Safety appliances--United States.
Automobiles--United States--Safety measures.
United States. National Highway Traffic Safety Administration--Appropriations and expenditures.
Harvard subject headings:
Automobiles--Rollover protective structures--United States.
Automobiles--Safety appliances--United States.
Automobiles--United States--Safety measures.
United States. National Highway Traffic Safety Administration--Appropriations and expenditures.
Princeton subject headings:
Automobiles--Rollover protective structures--United States.
Automobiles--Safety appliances--United States.
Automobiles--United States--Safety measures.
United States. National Highway Traffic Safety Administration--Appropriations and expenditures.