July 18, 1958
Dear Josh,
I am sorry indeed to hear that you and [. . .] Lederberg are going to leave us for pastures that you expect will be greener.  I hope your expectations will be realized.  We shall miss you.
I enjoyed your "Moon Dust"
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article in Science.  Your earlier suggestion that we must have non-earth-contaminants material from the first round trip to the moon should be stressed repeatedly even though that event will not, in all probability, occur for some years to come.
Regretfully yours,
Paul FC