4 31.5 gallons of beer (Abbr.), 3 letters
42 gallons of oil: Abbr., 3 letters
Crude container?: Abbr., 3 letters
Crude measurement: Abbr., 3 letters
Five cu. ft. of sugar, 3 letters
Large container: Abbr., 3 letters
Oil container: Abbr., 3 letters
Oil shipment: Abbr., 3 letters
OPEC unit of measure, 3 letters
Petroleum measure: abbr., 3 letters
Unit of oil production (Abbr.), 3 letters
Unit of oil production, briefly, 3 letters
Unit of volume: abbr., 3 letters
Any of various units of capacity, 3 letters
Beer holders: Abbr., 4 letters
Crude containers (abbr.), 4 letters
Ener.-related units, 4 letters
Large liq. containers, 4 letters
Oil quantities: Abbr., 4 letters