Sorry for the delay in getting back to you on this one BZ - having taken a look through a fair few mags and done a little more research, the gist of it is that while the pulp artists found a home working for Martin Goodman and other magazine publishers after the war, the wonderful pulp writers apparently did not. It's difficult to be certain, because from what I can gather, the majority of stories were written under pseudonym. Also, much of the content while claiming to be based more or less on real life experiences, were simply made up by the authors. One writer made the mistake of writing about a mythical agency on the west coast that arranged marriages for reformed prostitutes - and the offices were allegedly besieged by lonely men!
Anyway, harking back to adventure covers, here are a few by Mort Kunstler - who never worked for the pulps as far as I know, but did make a reputation for himself as a historical painter - especially of the civil war - and the last one is by Bama.