Bulletin issued by the U.S. Bureau of Mines containing a compilation of thermodynamic data regarding sulfides. There are tables for standard heat capacities (includes equations), standard entropies, high-temperature relative enthalpies (includes equations), Gibbs energy functions, enthalpies of formation (includes equations), Gibbs energies of formation (includes equations) and logarithms of the equilibrium constants. Documentation in the introduction explains how the tables are organized and use of the data.