Analysis of information sources in references of the Wikipedia article "فرن لافح" in Arabic language version.
...earliest blast furnace discovered in China from about the first century AD
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: صيانة الاستشهاد: BOT: original URL status unknown (link)...earliest blast furnace discovered in China from about the first century AD
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: صيانة الاستشهاد: BOT: original URL status unknown (link)