Tietze, Christopher. "Cooperative Statistical Program for the Evaluation of Intra-uterine Devices." Eighth progress report [typescript], 1967 June 30

Tietze, Christopher. "Cooperative Statistical Program for the Evaluation of Intra-uterine Devices." Eighth progress report [typescript], 1967 June 30, Box: 203, Folder: 11. Julian Samora Papers, 24426265. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/389914 Accessed September 27, 2026.