INDIANA UNIVERSITY BLOOMINGTON, INDIANA DEPARTMENT OF ZOOLOGY February 26, 1951 Dr. Joshua Lederberg Department of Genetics University of Wisconsin Madison 6, Wisconsin Dear Joshua: Would it be too much trouble to ask you to send me whatever references there are to work on recombination in bacteria other than K 127 I still haven't come across this and am about to get -to that part of my Genetics of Microorganisms course and would like to bring in to it the confirmation on other strains. With very best regards, as always, Cordially yours, T. M. vonnelborn TMS :gg