Shell oil company Shell sues oilmen for $5 million. Post Apr. 26, 1957 p.3 Shell Development Co. closes Denver subsidiary. Post Nov. 20, 1957 p.3 Review of five years activity in Denver area. Rocky Mountain Echo, v.6 #1 Jan., 1959, p.1-2 Plans to incorporate Tulsa operations into Denver. Post June 1, 1959 p.1 Tulsa and Denver areas consolidated into one organization. Shell,Rocky Mountain Echo, v.6 #6 June 1959 p 1
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