Maya History reconstructs the Classic Maya period (roughly A.D. 250-900) from the glyphic record on stelae at numerous sites, including Altar de Sacrificios, Copan, Dos Pilas, Naranjo, Piedras Negras, Quirigua, Tikal, and Yaxchilan. Proskouriakoff traces the spread of governmental institutions from the central Peten, especially from Tikal, to other city-states by conquest and intermarriage. Thirteen line drawings of monuments and over three hundred original drawings of glyphs amplify the text.