Columbia subject headings:
Harvard subject headings:
Energy conservation--Technological innovations--United States--Finance.
Renewable energy sources--Technological innovations--United States--Finance.
United States. Department of Energy--Appropriations and expenditures.
Princeton subject headings:
Energy conservation--Technological innovations--United States--Finance--Periodicals.
Periodicals.
Renewable energy sources--Technological innovations--United States--Finance--Periodicals.
United States. Department of Energy--Appropriations and expenditures--Periodicals.