Effervescent wines -- See Sparkling wines Here are entered general works on sparkling wines produced in regions and countries other than the Champagne region of France. Works on sparkling wines produced in the Champagne region of France are entered under Champagne (Wine) --names of specific sparkling wines, e.g. Champagne (Wine)
--subdivision Effectiveness under individual drugs and groups of drugs and subdivision Therapeutic use--Effectiveness under individual chemicals and groups of chemicals, e.g. Insulin--Therapeutic use--Effectiveness; Analgesics--Effectiveness
--subdivision Rating of under classes of persons and subdivision Officials and employees--Rating of under names of countries, cities, etc., and under individual government departments, agencies, etc.
Efficiency, Water -- See Water efficiency Here are entered works on the relationship between the amount of water required for a particular purpose and the quantity of water used or delivered, including measures taken to achieve more efficient water use and reduced demand.