The first chart is from 1963, the right side is a "corrected" version.

The second chart is from 2010 and the source can be attributed to Scott Burnstein and his resources in the CCC. So I can't argue for or against. Hope you enjoy enjoy.

Detroit - 1963
http://www.swfup.com/view/z1wa

Chicago - 2010
http://www.swfcabin.com/open/1324779271