sentences:  Ignacy Łukasiewicz improved Gesner's method to develop a means of refining kerosene from the more readily available "rock oil" ("petr-oleum") seeps, in 1852, and the first rock oil mine was built in Bóbrka, near Krosno in central European Galicia (Poland) in 1854.These discoveries rapidly spread around the world, and Meerzoeff built the first modern Russian refinery in the mature oil fields at Baku in 1861.At that time Baku produced about 90% of the world's oil.