Center has: 7X19 Aug 23, 1981; Mar 1982-Feb 1986; lacks: Dec 5, 1982; Jul 1, Aug 12, 1984; Nov 24-Dec 1, 1985. 7A25 Mar 1986-Jan 17/23, 1993; LACKS: Mar 16-23, Nov 2, 23, Dec 14, 1986; Jan 4-Mar 1, 22, 1987; Apr 15, May 27, Jul 8, Oct 7-14, Dec 9-16, 1990; Jan 6, Feb 17, Apr 21-28, May 19, Jun 16, Nov 17, 1991; Nov 8-15, 29, Dec 20, 1992. 7G4 Jul 16, Dec 10-17 1995; Jan 7-14,28, Apr 7-Aug 3,18-Nov 2,10-Dec 31 1996; Jan 1-11,26-Feb 8, Mar 2-sep 6,14-Dec 31, 1997; Jan 1-31, 1998.