July 1, 1958

Dr, H. C, Urey
Department of Chenistry
University of Chicago
Chicago 37, Tllinois

Dear Dr, Urey:

I would be grateful for reprints of your papers, and any others

by Dr. Donn that bear on the molecular @emposition of the interstellar
material and of the lunar surface, .

Youre sincerely,

Joshua Lederberg
Professor of Medical Genetics

P,S, I am sorry I had no oceasion to visit and ~eet you in Chieago in
connection with our paper that came out in this week's Science, Y am

sure there are many lacunae that you could fills our e*fort reflected
the second insight and interest of biologists,

Hk agh