Molecules, Volume 4 (1999)
- Issue 1 (January 1999) - 5 articles, Pages 1-51, Article M91
- Issue 2 (February 1999) - 1 article, Pages 52-61
- Issue 3 (March 1999) - 3 articles, Pages 62-80
- Issue 4 (April 1999) - 6 articles, Pages 81-121, Articles M92-M94
- Issue 5 (May 1999) - 5 articles, Pages 122-150
- Issue 6 (June 1999) - 3 articles, Pages 151-168
- Issue 7 (July 1999) - 5 articles, Pages 169-237
- Issue 8 (August 1999) - 8 articles, Pages 238-244, Articles M100-M99
- Issue 9 (September 1999) - 3 articles, Pages 245-263, Article M102
- Issue 10 (October 1999) - 20 articles, Pages 264-319, Articles M103-M115
- Issue 11 (November 1999) - 12 articles, Pages 320-337, Articles M116-M124
- Issue 12 (December 1999) - 7 articles, Pages 338-372, Articles M125-M126
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