DeGolyer and MacNaughton
5001 Spring Valley Road
Suite 800 East
Dallas, Texas  75244

Telephone: (214) 368-6391
Fax: (214) 369-4061   e-mail: degolyer@demac.com

DeGolyer and MacNaughton (Moscow)
Bld. 8-B, Mozhaisky Val
Office 501
121151 Moscow, Russia

Telephone:  7 (495) 660-7273
Fax:  7 (495) 660-7276  e-mail: degolyermos@demac.com

DeGolyer and MacNaughton (Houston)
5151 San Felipe, Suite 950
Houston, Texas  77056

Telephone:  (713) 273-8300
Fax:  (713) 784-1972   e-mail: degolyerhou@demac.com

DeGolyer and MacNaughton Canada Limited
Suite 1430, 311 6 Ave. SW
Calgary, AB, Canada T2P 3H2

Telephone:  (403) 266-8680
Fax:  (403) 266-1887   e-mail: degolyercal@demac.com