itsjustme
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Have a look at the links posted below, I think you would probably find the first one the most useful.
http://www.gov-files.com/public_record_search.asp?wid=&tcg=1&PID=9c24fed3-97a5-4831-a862-b9f953afc632
http://genealogy.about.com/od/mexico/
http://www.rootsweb.com/~mexwgw/
http://members.tripod.com/~GaryFelix/index1.htm
http://members.aol.com/mrosado007/mexico.htm
http://www.sfgenealogy.com/spanish/library.htm
http://www.sfgenealogy.com/norcal/resourcecenter/toc.htm
http://www.nmcpr.state.nm.us/archives/path-gene.pdf
Hope you find something there to help you.
espangor
if you are looking for border crossing this may help, the site is ancestry.com and you can use the site for 14 days as a trial
http://southwestlegacy.com/blog/mexican-genealogy-immigrants-usborder-crossing-records-1903-1957/
and this is the actual site
http://content.ancestry.com/iexec/?htx=List&dbid=1082&offerid=0%3a7858%3a0
wendy c
http://www.freewebs.com/nosotroslostejanos/links.htm
You did not specify Texas, but this list has many resources for Hispanic American research.
And my favorite source for what is out there...
www.cyndislist.com (see her locality section).