Cornell Education Department logic research program for primary grade children. Conducted by Prof. Ennis, April 1969

Cornell Education Department logic research program for primary grade children. Conducted by Prof. Ennis, April 1969, Job #61, Box: 12. Cornell University Media Services Photo Section records, 21-37-2227. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/163887 Accessed December 29, 2025.