Ижил төстэй зүйлс: Black Book - Chemical Valuation & Margin Trends (December 1999)
- Black Book - Chemical Valuation & Margin Trends (December 2003)
- Black Book - Chemical Valuation & Margin Trends (December 2002)
- Black Book - Chemical Valuation & Margin Trends (December 2000)
- Black Book - Chemical Valuation & Margin Trends (February 1999)
- Black Book - Chemical Valuation & Margin Trends (March 1999)
- Black Book - Chemical Valuation & Margin Trends (May 1999)