G. Ruppert

Water Resources Data, Washington, Water Year 1998

W. D. Wiggins, R. Smith, G. Ruppert, 1999 .

Water Resources Data, Washington, Water Year 2001

W. D. Wiggins, R. Smith, S. Knowles, 2002 .

Water Resources Data, Washington, Water Year 2000

W. D. Wiggins, S. Knowles, G. Ruppert, 2001 .

Well data, surface-water discharges, and nitrate concentrations, February 1986 - September 1987, in parts of the Pasco Basin, Washington

S. Cox, B. W. Drost, G. Ruppert, 1989 .

Water Resources Data, Oregon, Water Year 1992

G. Ruppert, L. E. Hubbard, M. Courts, 1993 .

Water Resources Data, Oregon, Water Year 1991

C. Kroll, G. Ruppert, L. E. Hubbard, 1992 .