Joining an acclaimed multivolume work funded by the National Historical Publications and Records Commission is a new volume of The Presidio and Militia on the Northern Frontier of New Spain. As the work of the Documentary Relations of the Southwest project, under the general editorship of Charles W. Polzer, S.J., the volumes stand alone in their translation and publication of a wide variety of documents that describe the Spanish exploration and conquest of what is now the southwestern United States and northern Mexico. The presidial system of northern New Spain's Central and...