Focuses on Santiago in the Valley of Guaxuco near Monterrey. Includes the descendants of Miguel de Montemayor and Monica Rodríguez, families who appear in protocolos and other documents, families in the census of 1745, and families who emigrated from the valley of Guaxuco to found Tamaulipas. Format is descendancy charts and alphabetical listings. Monterrey, 1997, 1st Ed. 176 Pgs. SPTXT.