Crossed Out--General Theory (2)--Ch.3 materials, Written in the 1960s (with Tung) published 1969, 1960s

Crossed Out--General Theory (2)--Ch.3 materials, Written in the 1960s (with Tung) published 1969, 1960s, Box: 25, Folder: 8. Walter Isard papers, 3959. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/428271 Accessed December 30, 2025.