Amended geogCS name from Qatar to Qatar 1974; amended geogCS for projCS 28600 from Qatar 1948 (code 4286) to Qatar 1974 (code 4285).  Amended area of use of geogCS 4270 and projCS 27039.  Added tfm 1535-36; tfm path 8375-76; single_geod_tfm 8524-25.