Dr. Rogers Calendar for 1964, 1966, 1967 & 1968, 1964, 1966–1968, https://huntbot.org/hibdarc/collections/231/231_Rogers_Bx2FF18_r.pdf. Hunt Institute for Botanical Documentation Archives. https://as.huntbot.org/repositories/2/digital_objects/4657 Accessed June 19, 2026.