W F Ritter

Development and testing of a weed wiper for roadside vegetative control.

W F Ritter, L J Kemble, 2002 .

Pesticide contamination of ground water in the United States--a review.

W F Ritter, W. Ritter, 1990, Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes.