LAWRENCE BERKELEY LABORATORY UNIVERSITY OF CALIFORNIA D + BERKELEY, CALIFORNIA 94720 © TEL. (415) 843-2740 March 31, 1975 Professor Joshua Lederberg Department of Physics Stanford University Stanford, California 94305 Dear Joshua: I couldn't find the journal article on the plutonium problem to which I referred in our telephone conversation last Friday, but I did find the enclosed reference to it in the Weekly Energy Report. With best regards, Co ally, Glenn T. Seaborg @& GTS/sms Enclosure