projects and the other studies mentioned, Armstrong was off to a respectable and
promising career in the laboratory and in the field of epidemiology.
Notes – Typhus, Dengue, Devil’s Grip
- Williams, R. C., loc. cit.; The National Archives (USA) at College Park,
 Maryland kept records of Armstrong’s first few years at the Hygienic Laboratory.
 The information was written in hand, in ink on 3 by 5 inch cards and stored in the
 RG (Record Group)-90 files. These files filled in an important gap on information
 about Armstrong’s early career; Harden, loc. cit.; NIAID Intramural
 Contributions, 1887-1987, viewable at
 http://www.history.nih.gov/articles/NIAID_Intramural_Contributions.pdf.
- Armstrong, C. Typhus on San Juan Indian Reservation, 1920 and 1921. Public
 Health Reports 37: 685-693, March 24, 1924.
- Cecil-Textbook of Medicine, Goldman, L. Bennett, J. C., et al Editors. 2000 21st
 Edition, W. B. Saunders, Philadelphia, London. Hornick, R. B. author of chapter
 on Typhus p. 1767. Hereafter referred to as “Cecil”.
- Zinsser, Hans, 1935 Rats, Lice, and History, Little, Brown and Co., Boston
- Carson, Rachel, 1962 Silent Spring, Houghton, Miflin Co. Boston.
- The Web site of “Navajo Nation” in 2006 discloses a healthy prosperous
 community with a vibrant economy, educational opportunities, natural resources
 in oil, gas and uranium, pride in its heritage and proud of its World War II
 Veteran heroes, “The Navajo Code Talkers” who contributed to victory in the
 South Pacific.
