Posted By:
Tim NewcombHi--
A few months ago, in Issues 6-7 of Old Cardboard, I published a two-part article about these sets that will answer all the questions you've asked. I expect these issues are still available. (If you are into prewar cards at all, I urge you to subscribe to Old Cardboard!)
www.oldcardboard.com
Richard is right: the Dean cards you posted are from "R313A", the 1934 Wheaties/Gold Medal Foods set.
Cheers,
Tim Newcomb