Letter from Thomas Gold to Dr Gene Simmons, Manned Spacecraft Center, Houston, Texas Encloses reprints which give some of his considerations on where and how water might exist on the moon, Gives his reasons. Is happy to see that an electromagnetic depth sounding method will be used on Apollo 17, though he still believes a depth sounder at a higher frequency should be on a vehicle. Hopes they can discuss some of these points when he gets to Houston on 15 November. 21 October 1971