[Sachel, J. C.?] letter to unknown recipient, 23 January 1911, Box: 6, Folder: 66. 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/4288 Accessed March 20, 2026.