Letter from Thomas Gold to Dr Thomas Thompson, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California Concerning moon radar maps with a view to extracting more information from them, and how this can be done. Considers the most remarkable feature to be the low reflectivity of Oceanus Procellarum. Does not want to write about the remarkable differences unless he is assured that they are genuine. 3 June 1971