Uranium isotopes and dissolved organic carbon in loess permafrost: Modeling the age of ancient ice - Ewing, Stephanie; Paces, James; O'Donnell, J.A.; Jorgenson, M.T.; Kanevskiy, M.Z.; Aiken, George; Shur, Y.; Harden, Jennifer; Striegl, Robert (Geochimica et Cosmochimica Acta, 2015)