I LOVE mid-20th-century lesbian pulp novels and am always on the lookout for resources relating to this awesome genre. Yale’s Beinecke Rare Book & Manuscript Library has a really cool digital collection of 25 front and back covers of classic lesbian pulps published between 1935-1958.
All of the cover images include extensive publication information on the books. They have a number of my favorites, such as Paula Christian’s Edge of Twilight. More info about the collection is also available on Beinecke’s blog!