an Entity references as follows:
David Talbot Day (10 September 1859 – 15 April 1925) was an American chemist and geologist who analyzed petroleum resources, and particularly the extraction of minerals from oil shale. He established the Mineral Resources Division of the US Geological Survey where he pioneered petrochemical fractionation and analysis using chromatographic techniques. He married Elizabeth Eliot Keeler in 1886 and the had two children