Managing Editor:
Peter L. Hammer,
Centre de recherches mathématiques

Université de Montréal

C.P. 6128
Montréal 101, P.Q.
Canada
(514)343-7579

Advisory Editors:

Cc.

M.

v.
J.

Berge
Harrison
Klee

H. van Lint

G.- C. Rota

Board of Editors:

P.
G.

M.

D.
B.
A.
F.
D.
D.
J.
J.
Ss.
D.
B.
S.
G.
M.

Vv.
B.
W.
S.
A.
K.

Camion

B. Dantzig
E. Fisher
Gale
Grinbaum
Hajnal
Harary

J. Kleitman
E. Knuth
Kuntzmann
Lederberg
Marcus

K. Ray-Chaudhuri
Roy
Rudeanu
Sabidussi

P. Schitzenberger

Sé6s-Turan

A. Trakhtenbrot
Tutte

Ulam

Whinston
Yamamoto

SEP 22 1972

DISCRETE MATHEMATICS

Publisher:

North-Holland Publishing Company

P.O. Box 3489

Amsterdam

The Netherlands

August 29, 1972

Dear Professor Lederberg:

I am sending you enclosed a paper by H. Brown, L. Masinter
and L. Hjelmeland "Constructive graph labeling using double
cosets",

May I ask you to have the kindness of refereeing
it or having it refereed for DISCRETE MATHEMATICS,

Needless to say how much indebted I will be to you

if you could take up this matter and inform us at

your earliest convenience about your opinion.
Sincerely yours,

/

(.

Peter L. Hammer

P.S.: Please kindly return the enclosed form as soon
as possible.