Columbia subject headings:
United States--Appropriations and expenditures, 2006.
United States. Dept. of Agriculture--Appropriations and expenditures.
United States. Dept. of the Interior--Appropriations and expenditures.
Harvard subject headings:
United States--Appropriations and expenditures, 2006.
United States. Department of Agriculture--Appropriations and expenditures.
United States. Department of the Interior--Appropriations and expenditures.
Princeton subject headings:
United States--Appropriations and expenditures, 2006.
United States. Department of Agriculture--Appropriations and expenditures.
United States. Department of the Interior--Appropriations and expenditures.
United States. Environmental Protection Agency--Appropriations and expenditures.