Letter from Hector Crawford, Managing Director of Crawford Productions, and attached document provides information regarding 1963 radio survey figures (ratings) gauging relative popularity of stations in Australian cities.The Flying Dogtor" series was broadcast on Australian Television Network (later becoming the Seven Network) between February and April 1964 (see item D254 for schedule).Typewritten, quarto, one page letter. Attached document is 7 foolscap, typed pages.radio survey data, radio ratings, the flying dogtor, robin boyd, crawford productions