With his short story collections it's almost the same story, his first is available having been reissued.
Those last two listed novels are so hard to find and so very expensive. German and Romanian speakers also profited. It seems French speakers especially lucked out. We need more of his novels and short stories and the one play to be translated into English.
It's a real shame he isn't more well known. The Bears' Famous Invasion Of Sicily (1947) In terms of what has been translated to English: