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JP. DR J. TINBERGEN

THE HAGUE, 20 April 1953

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Prof. P.C. MAHALANOBIS,
20kt Barackpore Trunk Road,
Calcutta 35»
India,

Dear Colleague,
I am sending you under separate cover
two English memoranda on some problems of isnmigration
which we studied with the help of a simple long-term
development model, I want to make it clear to you that
these attempts were only modest beginnings with many
shortcomings. Both my friend Verdoom and myself are trying
to develop and to improve these models and we shall "be
glad to let you have our working papers even if they are
not yet ripe for publicatiofu We enloyed our discussion
with you very much indeed, Imd we feel that it was most
stimulating to our own work,
I hope your ;)oumey/wlininevent^l and that
you found your institute in good order.
With best personal regards also for
Mrs Mahalanobis, I ESQ,
yours very sincerely,

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