Eastern Sea Frontier was designated in official records:
Admiral Earnest J. King, First Report to the Secretary of the Navy: Covering our Peacetime Navy and our Wartime Navy and including combat operations up to 1 March 1944 April 1944, pp. 75-88.
Samuel Eliot Morrison, History of United States Naval Operations in World War II, The Battle of the Atlantic, 1939-1943. ISBN 0-7858-1302-0
NEC Announces First Integrated Ocean Observation System for Taiwan; Taiwan Central Weather Bureau to Observe Taiwan Eastern Sea.
Nov 16, 2009; Tokyo, Nov 16, 2009 - (ACN Newswire) - NEC Corporation today announced a win for the first submarine-cable based integrated ocean...