The Hague, February 20, 1978
Mr. A.!-!. Costr.,
Board of Sditors
Journal of Policy Modeling,
P.O.Box 5299, Grand Central Station
New York, U.Y. 10017
Dear Er, Costa,
Thank you for yours of Januairj'' 28, 1973,
I want to Inform you that I gladly accept to
be a member of the advisory board of the
journal.
Yours sincerely.
J. Tinbergen
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