Charles A. Appel

Ground-Water Models Solved by Digital Computer

Irwin Remson, Charles A. Appel, Raymond A. Webster, 1965 .

Status of ground-water modeling in the U.S. Geological Survey

J. D. Bredehoeft, Charles A. Appel, J. Bredehoeft, 1976 .

A note on computing finite difference interblock transmissivities

Charles A. Appel, C. A. Appel, 1976 .

A Note on the Average Probability of Extreme Events

Charles A. Appel, 1968 .