Pulp magazines, authors and their stories. Adventure and Detective pulps.
Excellent! Mention is made that she only made around $10,000 in her life writing but that was good money back in the 1930's and 1940's. Certainly over $100, 000 in today's money.
Closer to $200,000 it seems. Not bad for a part-time job.http://www.measuringworth.com/uscompare/result.php?year_source=1935&amount=10000&year_result=2015