Air pollution control : benefits, costs, and inducements

von Gerhardt, Paul H.
Veröffentlicht in Public prices for public products (1972)

Improving air quality : some strategy alternatives

von Gerhardt, Paul H.
Veröffentlicht in Conner, James Richard, - 1942- Economics and decision making for environmental quality (1974)

Some economic aspects of environmental control

von Gerhardt, Paul H.
Veröffentlicht in Man and his environment (1972)