The work surveys pre-conquest copper use in Mexico and Central America, drawing on chroniclers, native paintings, and field observations to identify ore sources, smelting practices, and techniques for shaping metal. It assesses whether implements were cast or hammered, catalogs tool forms such as axes and chisels, and contrasts regional craft methods. A second section translates and analyzes a Maya manuscript, explaining katun-based chronology with tables of months and days and a proposed map of movements derived from the text. The author converts katun sections into years and summarizes the resulting chronological conclusions and their implications for early Central American history.