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For a historian, the BEST valid resource to use in research on the effect of the oil industry on the industrialization of Texas would be: .
A. a Texas history textbook published in 1920
B. an economists' report to a special session of the Texas Legislature on responding to industrial growth following Spindeltop
C. a summary account of the Spindletop gusher event published in the Galveston News
D. a biographical account written by a descendent of a person who worked in the first oil fields