If anyone's looking for more modern stuff amidst the lot, M.E. Kerr is the pseudonym of an award-winning YA author (I read her autobiography at some point) and under the name Vin Packer she had a book which launched the lesbian pulp adventure subgenre (out from different republisher, not on sale), according to her
Wikipedia entry.
So if you wanted potentially LGBT-friendly stuff, she's probably your best-bet, and the Fell series dates from the 80s if you're not up to 50s old-school tales.