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Oil Drilling |
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| Oil drilling equipment is a common sight throughout Oklahoma. The discovery of oil and gas deposits in the state in the 1920s changed the state’s main economic activity from agriculture to mining. Today, 4 percent of Oklahoma’s gross state product is derived from mining. | ||||||
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| Allen Russell/ProFiles West | ||||||
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| Appears in these articles: | ||||||
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| Oklahoma; United States (Geography) | ||||||
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