Warren Miller's The Cool World

I've been reading a number of historical pieces of criticism on white authors who wrote about "black" characters and the "black experience." Warren Miller's name appears frequently, usually mentioned in the same line as Shane Stevens.

I'm unfamiliar with Miller's name or his work. Google has turned up little and his Wikipedia entry, like Stevens', is fascinating in its brevity:

Warren Miller (1921–1966) was an American writer. Although he gained some notoriety for his books dealing with issues of race, as in The Cool World and The Siege of Harlem, and for his more political books such as Looking for The General and Flush Times, because of his early death due to lung cancer and his outspoken political views he has remained relatively unknown.

 

From what I can tell, everything of Miller's is out of print. I've put in requests at our university library and they're pulling 1st edition copies of The Cool World and The Siege of Harlem for me to read. In the meantime, is there anyone out there who's familiar with Miller and his work? Or is he as forgotten and mysterious as Shane Stevens?