Radio aids to navigation. by R. A. Smith Smith, R. A. (Robert Allan), 1909- Radio in aeronautics. Radio in navigation. Radar. TL695 .S55 629.13257 SMR "The material for this book was prepared in the first instance as a contribution to the Ministry of Supply (Air) Scientific war records." Cambridge [Eng.] University Press, 1947. 1947. 1947 Text xi, 114 p. : eng Modern radio technique Modern radio technique.