NARA Border Crossing Records
Last September, at the Hispanic Genealogy Conference held @NARA,
Washington, DC, one of the presentations had to do with "Mexican
Border Crossing (Immigration) Records. The presentation was given by
Claire Prechtel-Kluskens, and most of the details of her presentation
can be found at the following NARA site:
http://www.archives.gov/genealogy/immigration/border-mexico.html
It is very detailed, and should be read with care.
