This specific piece of correspondence may be found on Joshua
Lederberg's NLM website, identified with the ID:
bbajoa.
http://profiles.NLM.NIH.gov/BB/
There is no evidence that Norman Horowitz did work in biological warfare. However, it is difficult to ignore the fact that microbes found as a result of a search for back-contamination could also be purposely used in biological warfare. The interest of Fort Detrick in "BW" is not academic.