Rocket Air Mail -- One of the four air mail rockets roars into the sky on a one-mile trip from Searles ***** to Trona. The rockets, each carrying 600 letters, are ***** here annually by the Rocket Research Institute, a ***** rocket experimental organization, each letter carried cachet and U.S. Wright Brothers airmail stamp. The letter ***** Saturday, will be forwarded to all parts of the *****. Rocket Air Mail -- An air rocket roars into the sky on a one-mile trip from Searles Lake to Trona (US