Richardson, J. Lionel Mrs. letter to Morrison, Benjamin Yoe (1891–1966) , 27 July 1963, Box: 2, Folder: 24. William Winfield Ray collection of 20th century botanists correspondence and other materials, HIBDARC-0048. Hunt Institute for Botanical Documentation Archives. https://as.huntbot.org/repositories/2/archival_objects/3799 Accessed March 20, 2026.