POW in Korea Writes 4th Letter fd FolksMr, and Mrs. Charles H. Mas-sie, Route 4, have received another letter from their son, Pie, Robert Massie, 20, a prisoner of war. Massie said Tuesday that the letter, the fourth received from their son, arrived Saturday.The letter dated Jan. lg came via the “Chinese People’s Committee For World Peace. Massie •is held in Prisoner camp 3 in North Korea.In his latest letter, he iniquired about his brother, Timmy, 2; asked addresses of other brothers and sisters; said he was “treated all right” and advised his parents “don’t worry. Me said he had not received any mail although his parents have\p:rrniRDb:l!aarc-