1949.10-1997.7 1949.10-1997.9 1949.10-1993.7 1949.10—1997.9 19449.10-1997.9 1949.10-1999.6 1949.10-1987.6 1949.10-1993.6 1949.10-1999.12 1949.10-1987.12