Analysis of information sources in references of the Wikipedia article "Ploiești" in English language version.
7 December 1916 [...] Falkenhayn's Ninth Army turns to the north in hopes of capturing the oil fields and refineries at Ploesti, but Falkenhayn is too late: John Norton-Griffiths has done his work. The oil fields at Ploesti, Targoviste, and elsewhere are aflame and their refining facilities in ruins – a severe loss to the German war effort, as it will be months before production can be restored.
world's first oil refinery
world's first oil refinery