Diversity receiving equipment AN/FRR-3 and AN/FRR-3a - USA Voorschrift, Technical Manual, 11-872 Radio receiving set AN/FRR-12 - USA Voorschrift, Technical Manual, 11-896 Receiver-Transmitter BC-1335 - USA Voorschrift, Technical Manual, 11-879 radio amateur's handbook / by the Headquarters staff of the American Radio Relay League
