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This early-Sixties map was issued shortly after a former
pipeline company, the Tennessee Gas Transmission Company, was
renamed to Tenneco and entered gasoline marketing. The company
merged with Bay Petroleum of Denver in 1961 and later issued
dual-branded maps.
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Primarily an exploration and production company, Tesoro
entered retail marketing in 1968 with its purchase of Sioux
Oil of Newcastle, Wyoming. Marketing is now concentrated in
Alaska and the pictured map stands as one of the few examples
of this company's maps.
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