And in keeping with Pedro's comment, Floris, I forgot to add that
Bruce Kaufman has a very good essay in the ELGAR COMPANION on the
history of labor economics at Chicago.
You will also probably want to know that Rees sometimes participated
in the Committee on Underdeveloped Areas at Chicago, about which I
know little, but it may be worth checking out in the Chicago and/or
archives.
I have general notes on the Rees' papers which I can share with you if
you want to get a sense of what is available at Duke.
Ross Emmett