Title: Listeners
Subjects: Submarine warfare, World war, 1914-1918, united states, Submarines (ships), World war, 1914-1918, aerial operations, World war, 1914-1918, campaigns, Atlantic ocean, History, World War, 1914-1918, Naval operations, Submarine, Anti-submarine warfare, Hydrophone, Submarines (Ships), Aerial operations, Campaigns, Military campaigns, Aerial Military operations, Naval Military operations, United States Naval Engineering Experiment Station, World War (1914-1918) fast (OCoLC)fst01180746