1. AGN [Archivo General de la Nación, México, D.F.], 1590. Real Audiencia, Indios, Volume 4, Expediente 575. Order to compensate the Indios from San Juan Teotihuacan who help to produce salitre.
2. AGN, 1591a. Real Audiencia, Indios, Volume 5, Expediente 561. Claim that only 26 “Indios” are available to labor for the salitrero in Huehuetoca.
3. AGN, 1591b. Real Audiencia, Indios, Volume 5, Expediente 789. Order that the Indios of Xochimilco complete their labor on the cathedral and salitre-making before other tasks.
4. AGN, 1593. Real Audiencia, Indios, Volume 6, Expediente 597. Request to limit the work that the work that the Indios of Coyoacan to each week cutting firewood and making salitre.
5. AGN, 1599. Real Audiencia, Tierras, Volume 1584, Expediente 1. Survey and demarcation of the lands and people of Xaltocan.