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NYPL brings to my attention that the US 1940 Census is online at and they recommend you use their (NYC) phone book at to lookup the address for the name of the person you're looking for. I didn't find any lambiln in Manhattan or Brooklyn and then I stopped; There was a whole page of Rosen though. A full page seemed notable.
Then randomly trying to find one person by address in the census to match up with the name in the book, I started to find this kind of frustrating. It might benefit from some kind of styled crowd-sourced OCR.