Oklahoma
Agricultural and Mechanical College
DEPARTMENT OF BACTERIOLOGY

STILLWATER

Julyy 9, 1951

Dre Je Lederberg
Dente of Genetics
University of Wisconsin
Madison, Wisce

Dear Josh,

Would you please send me a culture of Ee. coli Kl2 that is
resistant to sodium azide? I don't care about any other marker
that it may or may not haveée

Many thankse

Sincerely,
(he Sresalork

Ae Eisenstark

A Esls

Wl