R. Levens

Hydrogeologic role of geologic structures. Part 2: analytical models

R. Levens, Roy E. Williams, D. Ralston, 1994 .

Environmental impacts of mine waste sandfill

R. Levens, C. Boldt, 1994 .

Environmental impacts of cemented mine waste backfill

R. Levens, A. Marcy, C. Boldt, 1996 .

Hydrogeologic role of geologic structures. Part 1: the paradigm

R. Levens, Roy E. Williams, D. Ralston, 1994 .