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1999 January 1, 1999   Vol. 119, Num. 1    February 1, 1999   Vol. 119, Num. 2    March 1, 1999   Vol. 119, Num. 3    April 1, 1999   Vol. 119, Num. 4      May 1, 1999   Vol. 120, Num. 1    June 1, 1999   Vol. 120, Num. 2    July 1, 1999   Vol. 120, Num. 3    August 1, 1999   Vol. 120, Num. 4      September 1, 1999   Vol. 121, Num. 1    October 1, 1999   Vol. 121, Num. 2    November 1, 1999   Vol. 121, Num. 3    December 1, 1999   Vol. 121, Num. 4