Columbia subject headings:
Automobiles--Fuel systems.
Energy policy--United States.
Motor fuels--Environmental aspects--United States.
Motor fuels--United States.
Spark ignition engines--Alternative fuels.
Spark ignition engines--United States--Alternate fuels.
Synthetic fuels--United States.
Harvard subject headings:
Energy policy--United States
Motor fuels--United States.
Renewable energy sources--United States
Technical reports
Princeton subject headings: