Letter from Thomas Gold to Dr David S Heeschen, Director, National Radio Astronomy Observatory, Charlottesville, Virginia Tells Dr Heeschen that Dave Jauncey will have to leave at the end of August unless a waiver of his visa restriction can be arranged. Says that if Dr Heeschen could write about the importance of the new techniques of independent interferometry and Jauncey's involvement in them, it would help. 25 March 1968