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Lange Houtstraat 26, The Hague

December 10

5

Dear Trailing,
Thank you very much for sending me the report
"by Klein which I already superficially read through.
Needless to tell you that I am very much interested
in it. I shall tiy to formulate any criticisms that
may come up.
Would it be possible to produce charts indicatinfi
the "explanations" of the various series; that would
greatly facilitate my task.
I am arranging to exchange publications both with
the Centraal Bureau voor de Statistiek and with the
Centraal Plabureau,
Enclosed I am sending you two more offprints; unfortunately I have none left of my article in 7?eltwirtschaftliches Archiv "Zur Theorie der langfristiger
Entwicklung", W.A. 55(May 1942) page 511, In that pape
I dealt with some simple theories of trend-movements
based on a Douglas' production function and a simple
population law. I tried to confront my results with
some ol{}oer va*ipfctions on trend between 1870 and 1914»
Thank you also very much for your data on townbuilding in connescJEion with atomic bombs.
Tine, the children and myself were extremely glac
with the precious parcels you sent us. All in it satis
fies very urgent needs.
With best personal regards,
Yours,
Dr. Tj.Kocpmans,
Cowles Commission,
Chicago 57» Illinois

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