Photo collage of Abel Wolman and historic water treatment plants, plus a graph showing decline in U.S. typhoid cases

Credit: John Hopkins University, Milton S. Eisenhower Library

Photo collage of Abel Wolman and historic water treatment plants, plus a graph showing decline in U.S. typhoid cases

Source: Oscar C. Pancorbo, Ph.D., Director Sen. W.X. Wall Experiment Station

Source: Cynthia Harris, Jersey City Public Library

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