"xmACIS". National Oceanic and Atmospheric Administration. Retrieved November 21, 2023.
usgwarchives.net
files.usgwarchives.net
Joaquin Miller (1894). "Erasmus Darwin Leavitt". History of Montana. USGENWEB Montana Archives. Archived from the original on February 26, 2012. Retrieved September 1, 2009.
Joaquin Miller (1894). "Erasmus Darwin Leavitt". History of Montana. USGENWEB Montana Archives. Archived from the original on February 26, 2012. Retrieved September 1, 2009.