Ижил төстэй зүйлс: Black Book - Chemical Valuation & Margin Trends (April 1998)
- Black Book - Chemical Valuation & Margin Trends (April 1997)
- Black Book - Chemical Valuation & Margin Trends (April 2002)
- Black Book - Chemical Valuation & Margin Trends (February 1998)
- Black Book - Chemical Valuation & Margin Trends (March 1998)
- Black Book - Chemical Valuation & Margin Trends (May 1998)
- Black Book - Chemical Valuation & Margin Trends (June 1998)