My aunt -- born and raised in Chicago -- and who has never thrown away a thing in her life, has given me "Olcott's Cook County Zoning and Land Values 1945-6" It's not really a plat book, but it shows the layout, street names, etc. of parcels.
If you're interested, I'll be happy to scan and send a few pages so you can see if it's of any use to anyone who searches Cook County.
email my personal email: alixott@gmail.com
Alix
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