PROJCS["US National Atlas Equal Area",
GEOGCS["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",45],
PARAMETER["central_meridian",-100],
PARAMETER["false_easting",0],
PARAMETER["false_northing",0],
UNIT["Meter",1]  ]
