January 31, 1950.

Mr, G. W. Walls,
Biological Abstracts,
Univ. of Penna.
Philadclphia 4, Pa.

Dear Mr. Walls:

We will be glad to abstract ths journals mentioned in your
isttier of January 24th. Professor J. F. Crow has agreed to col-
laborate on the AMERICAN JOURNAT, OF HUMAN GENBPTICS, and irs.
Lederberg and I will handle the Zeit. ind. Abst. Vererbungsishre.
The latter journal has appeared very irregularly since the war.
Can you tell me when it was last covered, so that wa may know
at what point to begin our work? I am not sure that our library
has carried any issues of recent date, but our librarian assured
me that we would receive any issues that were published and
could be purchased,

Sincerely,

‘Joshua Lederberg
Assistant Professor of-Genetics