R.A.Heinlein (1907-88) also posited water on (within) the Moon in his 1966 Novel, “The Moon is a Harsh Mistress” (Hugo Award 1967). Exiled convict settlers mine veins of water-ice for both human and agriculture. Agriculture is the source of necessary food for an overpopulated Earth under UN World Government. Good lesson in being at the top of a gravity well!
One of Heinlein’s best.