A planner's guide

by Kalbermatten, John M., Mara, D. Duncan autor/a, Julius, DeAnne S. autor/a, Gunnerson, Charles G. autor/a
Published 1980

Sanitation and disease health aspects of excreta and wastewater management

by Feachem, Richard G. A., Bradley, David J. autor/a, Garelick, Hemda autor/a, Mara D. Duncan autor/a
Published 1983