468 _ Sonora 
FRONTIER MISSION ARCHIVES. 
As has been indicated, the frontier missions of Sonora were closely asso- 
ciated with those of Arizona. Most of the early Jesuit sites have grown into 
modern towns, with parish churches, and presumably in many of them there 
may be found early records connected with the frontier of the United States, 
similar to those of the frontier towns of Tamaulipas. At the parish church 
of Magdalena, for example, important records of the San Ignacio mission 
were found. A search at Santa Cruz, San Ignacio, Tubutama, Saric, Caborca, 
and other frontier places might result in the finding of other similar records. 
It may be noted that a considerable number of the administration books of 
these frontier missions have found their way into the Bancroft Collection, at 
the University of California. 
