Miscellaneous items received from Mae K. Millstone (I.K. Langman's sister) 15 November 1991, undated, https://huntbot.org/hibdarc/collections/179/179_Langman_Bx2FF8_r.pdf. Hunt Institute for Botanical Documentation Archives. https://as.huntbot.org/repositories/2/digital_objects/5033 Accessed July 26, 2026.