Pulp Poetry

I've been writing a series of poems which are adaptations of fantasy stories in the public domain. I've completed three of them:

• HP Lovecraft's Under the Pyramids.
• Robert E Howard's The Mirrors of Tuzun Thune.
• Clark Ashton Smith's The Garden of Adompha.

I'm currently working on Edgar Rice Burroughs' A Princess of Mars (the same book that the upcoming John Carter film is based on), which is a bigger project since it's a novel rather than a short story.

Anyway, I was wondering whether anyone had suggestions for other stories I could turn my attention to once I finish A Princess of Mars. If so, please leave a comment.

PS All four of the stories I've mentioned here can be found on en.wikisource.org.