Claim: Nikolay Pogredov, a Russian and Soviet hydrogeologist, oversaw the construction of the first experimental oil shale open-pit in Estonia, and, in 1916-1923, published a series of papers on this subject.
Evidence: Nikolay Pogrebov, (Russian: Николай Фёдорович Погребов; 17 November O.S. 5 November] 1860 in Saint Petersburg – 10 January 1942 in Leningrad) was a Russian and Soviet hydrogeologist and an engineering geologist. He oversaw the construction of the first experimental oil shale open-pit in Estonia. In 1916–1923, he published a series papers on this subject.