I am researching in Sonora and searching for the elusive TISNADO who
migrated to Sonora from someplace in the seventeenth century.

These websites have been most useful to me and my be of use to someone
who finds themselves reserarching in Northwestern Mexico.

http://www.colson.edu.mx/testamentos/proyecto.html
http://www.nps.gov/tuma/M2000.html
http://www.statemuseum.arizona.edu/oer/index.shtml

George