A copy of an article titled, "The efficient representation of inverted lists," by Donald Cowan, James Wesley Graham, and James W. Welch. The article was published in Congressus Numerantium 17, Proceedings of the Seventh Southeastern Conference on Combinatorics, Graph Theory, and Computing, February 9-12, 1976, pages 257-272.

Copies of three manuscripts that were presented at the 9th Canadian DECUS Symposium in Toronto, Ontario in January 1976. Includes:

• 1. Cowan, D.D., P.H. Dirksen, J.W. Graham and J.W. Welch. Development of educational software using the DEC PDP-11. 17 pages.

• 2. Cowan, D.D., Jack Schueler and J.W. Welch. Debugging aids for the PDP-11. 5 pages.

Research materials created and accumulated by Donald Cowan related to data directed design. Includes overhead transparencies and notes. Also contains a copy of the article titled, "A data-directed approach to program construction, by Donald Cowan, James Wesley Graham and J.W. Welch as well as a copy of the article titled, "A formalization and explication of the Michael Jackson Method of program design" by J.W. Hughes.

Three copies of an article titled, "Batch compilers for student programs on the PDP-11," by Donald Cowan, P.H. Dirksen, J.W. Graham, J.W. Welch, and T. Wilkinson. This article was published in the Proceedings of the Digital Equipment Computer Users Society, May 1976, pages 919-921.