Denver. Business. Petroleum Feature on Cougar Petroleum Corp., independent-oil company. Denver Monthly V. 9 #4 Ag 1980 p.31 Exploration firms, Oiltech, Inc. and Premier Energy Corp. to merge. RMN Ag 13, 1980 p.74 Keba Oil and Gas Co. plans to expand to 50 wells for exploration. RMN Ja 23, 1981 p.65 Royal Resources Exploration, Inc., Denver oil and gas CO., seeks change in 'unfair' tax law. RMN D 22 1981 p.72 40