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PROF. DH J . TINBERGEN

The Hague, 5 November 1951
S i j z e n l a a n ^^-l

Mr William B. SIMPSON,
Managing Editor of Econometrics,
The University of Chicago,
CHICAGO 37, Illinois, USA.
Dear Mr Simpson,
During my absence the three extra copies
you asked for were sent to you. Unfortunately some more
typing errors have been discovered; therefore I am sending
you another four copies with corrections.
In discussions on the paper held at the
Hague and at Cambridge some interesting small additions
have be.ui born, iA*iich I shall send to you within a few
days. They relate to page 11, line 9 from the- bottom, hlch
will be formulated somewhat differently, wher-as about
half a page or a page will be added.
Yours very sincerely.

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