“Economic” scale of patient progress used to evaluate participants in the University of Minnesota’s Transsexual Research Project. Donald W. Hastings, MD, and Colin Markland, MD, “Post-Surgical Adjustment of Twenty-Five Transsexuals (Male-to-Female) in the University of Minnesota Study,” Archives of Sexual Behavior 7, no. 4 (1978), 330. From the Transgender Informational Files, 1941–2014, in the Transgender Research Guide (Tretter-357), Jean-Nickolaus Tretter Collection in GLBT Studies, University of Minnesota.