Letter from Thomas Gold to Dr Robert P Bryson, Code MAL, NASA Headquarters, Washington, DC Encloses their laser experiment report. Thinks it makes clear that one can infer that the rate of movement of the lunar soil by micrometeorites is c. 1000 times the observed rate of erosion of rocks. The laser remains set up and could do other jobs related to lunar erosion. Asks Bryson to phone him at his convenience to arrange his visit as discussed in the fall. 13 February 1973