Dear colleagues,

May I ask for help with the following copyright issue? 
(Unfortunately, I am not an expert in copyright-law.)

I have come about some unpublished correspondence of Paul 
Rosenstein-Rodan with Gottfried Haberler and Oskar Morgenstern, some 
letters of which I would very much like to reprint verbatim.

Does anyone know who owns the copyright to the unpublished writings 
of Rosenstein-Rodan? Is there any formal procedure how I can find out 
the identity of the copyright-owner? And what would be the correct 
legal way to proceed if the search for the owner were futile?

Many thanks in advance for any help.

Hansjoerg Klausinger
Associate Professor
Department of Economics
WU (Vienna University of Economics and Business, Austria)
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