Small water purification systems - Case, Richard B.; Ristau, Toni K.; United States. Bureau of Land Management. Division of Scientific Systems Development; United States. Bureau of Land Management. Division of Engineering (Denver, Colo. : United States Department of the Interior, Bureau of Land Management: Available from Denver Service Center, 1981)
"Division of Scientific Systems Development and Division of Engineering, Bureau of Land Management, U.S. Department of the Interior."
"July 1981."
Periodic updating anticipated.
Keywords: Water -- Purification -- Equipment and supplies; Drinking water -- Standards -- United States