Wastewater Effluents and Sludge in the Production of Crops for Human Consumption; and Water and Sanitation Services for Megacities in the Developing World.

ELLEN A. DE GUZMAN is a senior project assistant at the National Research Council's Water Science and Technology Board. She received a B.A. from the University of the Philippines and is currently taking classes in economics at the University of Maryland University College.


DAVID A. DOBBS is a freelance writer and editor specializing in environmental, building, health, and science issues. His book The Northern Forest, coauthored with Richard Ober, won the Vermont Book Publishers Association Book of the Year award in 1995. Dobbs has edited texts on sports physiology, construction, sailing, horticulture, and natural resources issues; he writes frequently for a variety of publications including Popular Science, Forest Notes, Boston Globe, Vermont, Vermont Life, Parenting, and Eating Well. Originally from Texas, he received his B.A. degree from Oberlin College and now lives in Montpelier, Vermont.

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