Situated on the banks of the Usumacinta River in northwestern Guatemala, Piedras Negras is an important Maya site known for its carved monuments and panels. Between 1931 and 1938 the University Museum conducted research at Piedras Negras, excavating the site core, producing an excellent site map, and documenting architectural developments to an unprecedented standard. Project member Tatiana Proskouriakoff revolutionized Maya historiography with her architectural reconstructions and visionary synthesis of the position and dating of texts and monuments at the site. Innovative excavation...