- document
- Boswell, Robert J. (author), Nelka, John J. (author), Denny, Stephen B. (author) report 1976
- document
- Nelka, John J. (author) report 1974
- document
- Nelka, John J. (author) report 1974
- document
- Boswell, Robert J. (author), Nelka, John J. (author), Kader, Richard D. (author) report 1975