John M. Ford’s Growing Up Weightless is one of the two best Heinlein juveniles not written by Heinlein (the other being Alexei Panshin’s Rite of Passage.). A lean, vividly imaged coming-of-age story set on the Moon, it should be a classic of science fiction. It isn’t (or at least, not one that’s easy to track down). Ford died tragically young without having designated a literary executor. The rights to his works reverted to his blood relatives, who seem intent on erasing evidence of Ford’s writing career. While Tor has done a masterful job of keeping their John M. Ford books, The Last Hot Time and Heat of Fusion and Other Stories in print, Growing Up Weightless was published by Bantam and is out of print.
— just one of several books noted by James Davis Nicoll in his piece “Why the Hell Are These Books Out of Print?” published by Tor