PROJCS["US_National_Atlas_Equal_Area",
    GEOGCS["GCS_Unspecified datum based upon the Clarke 1866 Authalic Sphere",
        DATUM["D_Sphere_Clarke_1866_Authalic",
            SPHEROID["Clarke_1866_Authalic_Sphere",6370997,0]],
        PRIMEM["Greenwich",0],
        UNIT["Degree",0.017453292519943295]],
    PROJECTION["Lambert_Azimuthal_Equal_Area"],
    PARAMETER["latitude_of_origin",55],
    PARAMETER["central_meridian",20],
    PARAMETER["false_easting",0],
    PARAMETER["false_northing",0],
    UNIT["Meter",1]]