Collection includes the working papers, correspondence, scientific data, teaching and biographical material of Samuel Epstein. Epstein had a distinguished career in isotope geochemistry, resulting in the development of the carbonate paleotemperature scale, as well as the publication of some pioneering papers with regards to the measurements of paleotemperatures and of the isotopic composition of water in the meteorological cycle. Epstein carried out important research on the Antarctic and Greenland ice sheets, on isotope composition of hydrogen and oxygen in tree rings, and on the origin of meteorites, tektites, and lunar rocks and minerals.