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Caption: Avro Lancaster MK.10MP maritime patrol aircraft, 107 Rescue Unit, Royal Canadian Air Force

Lancaster bombers were converted into reconnaissance aircraft after the Second World War and remained in service until 1956. Starting in 1947, Lancasters photographed 3.5 million sq. mi. (5.6 million sq. km.) in the Canadian North and Arctic and established the first accurate maps of these immense areas. (DND, PCN-2950)