Don's Directory: Rocky Mountain Edition covers the upstream and midstream sectors of the oil and gas industry across Montana, North and South Dakota, Wyoming, Nebraska, Utah, Colorado, Arizona and Northern New Mexico. The directory contains Exploration, Production, Geophysical, Drilling, Well Servicing Contractors, Equipment, Supplies, Services, Midstream, Government, and Association sections, giving you the most up-to-date and comprehensive directory of players in the petroleum industry in the region. Don's Directory: Rocky Mountain Edition currently has information on about 5628 companies, 13,637 locations, 15,092 people.