National Research Council (U.S.). Committee on Challenges and Opportunities in the Hydrologic Sciences.
Washington, D.C. : National Academies Press, [2012]
Symons, James M.
Cincinnati : Consumer Protection and Environmental Health Service, Bureau of Water Hygiene; for sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington, 1969 [that is, 1970]