Johnston, William R.

Management of agricultural drainage water quality edited by Chandra A. Madramootoo, William R. Johnston, and Lyman S. Willardson 1997 Management, operation, and maintenance of irrigation and drainage systems prepared by the Committee on Operation and Maintenance of Irrigation and Drainage Systems of the Irrigation and Drainage Division of the American Society of Civil Engineers ; editors, William R. Johnson, James B. Robertson ; contributing authors, Albert J. Clemmens ... [et al.] 1991