Operator absence in the transit industry / Rick R. Jacobs, Kimron L. Shapiro, William J. Ray (Pennsylvania Transportation Institute).Rick R Jacobs1983EN
Long-term Effects of Surface Coal Mining on Ground-water Levels and Quality in Two Small Watersheds in Eastern OhioWilliam L. Cunningham1990EN
Hydrogeology of a Biosolids-application Site Near Deer Trail, Colorado, 1993-99Tracy J. B. Yager2003EN