For Re-entry into the U.S. From Mexico
Following is information from the U.S. Department of Customs and Border Protection Agency regarding passports needed for re-entry into the U.S.
U.S. Department of Customs and Border Protection Publication
The following info has been taken from the U.S. Department of State website. Here’s a link if you would care to confirm these findings for your info as well: U.S. Customs and Border Protection
If the above website changes or moves you can access this next website and then go to the bottom, right of the page and select “Traveling Outside the U.S. Documents Needed” http://www.getyouhome.gov/html/eng_map.html
How to get a passport in a hurry: http://travel.state.gov/passport/hurry/hurry_831.html
International Travel: Resource Library: http://www.usa.gov/Citizen/Topics/Travel/International.shtml
For Entry into Mexico from the U.S.