11. Danger area charts [for north central, north eastern, north western, south central, south eastern, and south western sections of U. S.]. Scale 50 m.=0.4 in. Bookmark Corporate/Agency Authors: Coast and Geodetic Survey and Commerce Dept. Publisher: Coast and Geodetic Survey Date: Apr. 13, 1949 SuDoc number: C 4.9/15:N.Central/949,etc.