Reply to Attn of:

National Aéronautics and
Space Administration

Washington, D.C.
20546

SBL (RSY:dr) August 29, 1977

Dr. Joshua Lederberg

Department of Genetics

Stanford University Medical Center
Stanford, CA 94305

Dear Josh:

As per our telephone conversation, here are some reports
and published reprints having to do with microorganisms
in aerosols. The original purpose of the work is evident
in the texts. I am also including some work by my people
at the Cape who actually do the microbial monitoring of
planetary spacecraft. I had asked them to see if they
could relate numbers microbes with numbers of other
particles.

In any case, you may find some of it interesting. It
is not necessary to return any of this.

Sincerely,

Oh

Richard S. Young

Director, Planetary Biology >
and Bioscience ‘

Office of Space Science

Encls.