On Joshua Lederberg's "Profiles in Science" NLM website, searching for "Esther Zimmer" returns the following PDF file. "Esther Zimmer" is mentioned on the fifth page, page 349.
Click to view PDF file B. Lee Ligon, "Biography of Joshua Lederberg"
Seminars in Pediatric Infectious Diseases 9(4), 1998
Note: the file opens in a new instance of your browser.
This specific piece of correspondence may be found on Joshua
Lederberg's NLM website, identified as with the ID:
bballa.
http://profiles.NLM.NIH.gov/BB/