Patrick, SPDB did not choose Sand Hills for 1990-99. He chose Shadow Creek. Matt's cryptic note to Mark B. hints Shadow Creek may be right, too.
Good Catch Jim.
Updated:
1900-1909 = NGLA (Some including Ran have it as 08 or 09) (Mark)
1910-1919 = Pebble Beach (1919 opening)
1920-1929 = Fisher's Island
1930-1939 = Augusta (Jeff, Tom, Mark)
1940-1949 = Peachtree (Jeff, Tom)
1950-1959 = Oakland Hills (Jeff, Tom, SPDB, Mark)
1960-1969 = Harbour Town (Jeff, Tom, SPDB, Mark)
1970-1979 = Muirfield (Tom, SPDB)
1980-1989 = TPC (Jeff, Tom, SPDB)
1990-1999 = Shadow Creek (SPDB)
With Pebble at 1919 instead (although Merion could be right too) and deducting that Cypress has been guessed and is wrong (I think) the 20's have quite a few options of golden age courses. Other possibilities include Riveria, Winged Foot, Seminole, LACC N., etc.