Experimentation in the adaptation of the overhead projector utilizing 200 transparencies and 800 overlays in teaching engineering descriptive geometry curricula, June 1, 1959 to August 31, 1960. Final report, grant no. 741023.09, U. S. Office of Education, Dept. of Health, Education, and Welfare.

"Corrected graph iv" leaf inserted.

Experimentation in the adaptation of the overhead projector utilizing 200 transparencies and 800 overlays in teaching engineering descriptive geometry curricula

"Corrected graph iv" leaf inserted.