Worrell E, and others Potentials and policy implications of energy and material efficiency improvement Worrell E, and others - New York United Nations U S A 1997 - 103p. cm. - United Nations, Policy Coordination And Sustainable Development (Deptt of-) , Publication . Source: General Book Subjects--Topical Terms: Fuel Dewey Class. No.: X9(F55):75.1.N9, N7/UN