iit.dat - https://tptc.iit.edu/index.php/thermo-database
ssub - SGTE, Thermodynamic Properties of Inorganic Materials, vol. 19 (Berlin, Germany: Springer-Verlag, 1999).
mat_proj - http://www.materialsproject.org
konigs - Konigs, et. al. Thermodynamic properties of actinides and actinide
compounds
corrections - Kubachewski
legacy.dat - Previous iteration of OQMD calculations; a test set
