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Border Crossing Records
The National Archives site provides a lot of background information - the why and how - of the border crossing records. See that information at this site:
http://www.archives.gov/genealogy/immigration/border-mexico.html
This will provide valuable insight into why, how, and what information was gathered. Parts 2,3, & 5 are particularly informative.
Since my family crossed into US in 1916, I am waiting for the border records from El Paso, 1905-1927 (non-statistical): A3406, comprised of 119 rolls. Also want to see A3412, statistical, comprised of 96 rolls.
The filming is scheduled to be completed by next spring or summer, I think (2008).
Natalie