||The lightest of all gases, occurring chiefly in combination with oxygen in water; exists also in acids,
bases, alcohols, petroleum, and other hydrocarbons.
||A gaseous mixture of hydrocarbon compounds, the primary one being methane.
|Petroleum Administration for Defense (PAD) Districts
||Geographic aggregations of the 50 States and the District of Columbia into five districts
by the Petroleum Administration for Defense in 1950. These districts were originally defined
during World War II for purposes of administering oil allocation.
Description and maps of PAD Districts and Refining Districts.