THE ROCKEFELLER UNIVERSITY 1230 YORK AVENUE NEW YORK, NY 10021 June 23, 1987 Jk& JOSHUA LEDERBERG PRESIDENT Dr. James L. Gooding SN2 NASA Johnson Space Center Houston, Texas 77058 Dear Dr. Gooding: I am responding to your letter of May 27th which reminded me of prior correspondence going back to last February concern- ing Mars-sample-science. Although I was a very enthusiastic member of the Mars Viking Lander experiment team, I have more or less retired from space science in the interval and I do not contemplate playing an active role in a program that will still take some years to reach fruition. So I was not sure how pertinent my remarks would be. I do however have a single policy point that I would like to leave for the record. Certainly the scientific value of return samples from Mars would be enormous for a wide range of disciplines. This is sometimes confused with a manned return mission and I hope that you will not fall into that trap since it will necessitate a vast multiplication of resources in a way that will add very little to the scientific utility. On the other hand it seems to me absolutely vital that we secure samples from a variety of locations and I am obviously speaking to the necessity of a,rover which would be able to explore a variety of terrains <——and secure samples that are representative of a number of Unhmanei quite different sites within its purview. I don't have the ———— original copy of the announcement and if there is time I would like to have a look at it and perhaps I would have more to say in response. Yours sincerely, J ua Lederberg