This is a 1951 US Air Force cloth chart for pilots. The chart is a 38 1/2 x 38 1/2 inch square. The maps are CL 306 and CL 307. CL 307 shows Korea, the Sea of Japan and the Japanese islands. CL 306 shows the Yellow Sea, Korean Bay, Korea and China. The legends for the maps show the limits of ice formation from December through April and surface currents in the bodies of water on the map. There is a statement in red on the chart, "Boundaries shown in red are post war de facto or treaty boundaries not necessarily recognized by the US government." The charts are marked as published by the aeronautical chart service US Air Force, Washington, DC July 1950. The chart is also marked Lithographed by KG May 1951. Condition is very good and the maps are clear, bright and unstained.