1. Analytic Sciences Corporation Quarterly progress report for the period ending 30 June 1979 Silver Spring, Md. 1979
2. Anderson , E. A. National Weather Service river forecast System-Snow accumulation and ablation model Silver Spring, Md. 1973
3. Fread , D. L. A dynamic model of state-discharge relations affected by changing discharge Silver Spring, Md. 1973
4. Fread , D. L. Numerical properties of implicit four-point finite difference equations of unsteady flow Silver Spring, Md. 1974