Tulsa's growth stemmed from its roots in the oil industry. In fact it was known as "The Oil Capital of the World." In the 1980s the focus of industry shifted away from the oil business, but it's still the industry that built much of this City..

An old picture of the Mid-Continent Refinery, with downtown in the background. This was later the DX Refinery, and then Sunoco.

1930: Skelly Oil Company gave out this postcard with a picture of the International Petroleum Exposition held at the Tulsa Fairgrounds. This was back when Tulsa was the "Oil Capitol of the World."