Columbia subject headings:
United States--Appropriations and expenditures, 2006.
United States. Dept. of Homeland Security--Appropriations and expenditures.
Harvard subject headings:
United States--Appropriations and expenditures, 2006.
United States. Department of Homeland Security--Appropriations and expenditures.
Princeton subject headings:
United States--Appropriations and expenditures, 2006.
United States. Department of Homeland Security--Appropriations and expenditures.