Ah thanks! I was looking in a few other guides and the PSA set registry but the Standard lists all 5 types. So just to close the loop and post my findings - the Doerr is in the Type 4 set which is one of two (Type 4 and Type 5) that are under the unofficial "creamy" designation. ! The PSA holds them all in one big super set here:
http://www.psacard.com/psasetregistr...ite.aspx?c=569
But those are in fact 5 different sets types from 1936 and 1937.
Thank so much for pointing me in the right direction!