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Unfortunately there would have been no legal mandate for these records to have been preserved. The only thing I can think of is to contact libraries (both public and university), museums, archives and historical societies for the Chicago and Illinois area on the off chance that they might have them or know where any might be found.
Have you already tried the Illinois Digital Archives? Even if the records themselves aren't on it, the list of contributing institutions might be useful.
Thank you for the response. I thought it might be unlikely to find something like this. Yes, I was going to try the Chicago History Museum. And I will check the Illinois Digital Archives also. Thanks, joan
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Dear Ms. Stachnik,
Thank you for posting your request on History Hub!
Information about Wilson and Swift companies may be included in the Chicago Stockyards Collection held at the University of Illinois at Chicago in its Special Collections. For more information, please see https://www.uic.edu/research.
You also may wish to contact those two private businesses to ascertain if any employment records are still being maintained or exist for the 1910-1950 timeframe. Some businesses may also employ an archivist who will be able to assist you further if the records are available for research use by the general public.
We hope this is useful. Best of luck with your research!
Thank you! joan