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Romania and the Soviet Union right up until the invasion. I believe there might have been some small wells in Austria, to the north-east of Vienna. For much of the war Germany relied on synthetic oil made from low grade coal (by hydrogenation). By far the biggest factory was the Leuna-Werke, which claimed to be the biggest single industrial plant in the world at the time. Making oil from coal is an extremely expensive process and requires a very large investment. The construction of the large synthetic oil plants was one of the clearest early signs that Germany was preparing for war. Joncey

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18y ago

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