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Annual report for the year ended June 30 .... United States National Museum. EXHIBITS 25. Modernized petroleum exhibit, with original experimental model of Burton-Humphreys still. This thermal-cracking process, introduced in 1913,
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Annual report for the year ended June 30 .... United States National Museum. Modernized petroleum exhibit, with original experimental model of Burton-Humphreys still. This thermal-cracking process, introduced in 1913, made it
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