Do passports need to be valid for 6 months for trip to Spain?

I am a teacher traveling with students to Spain in March/April 2011. Do all passports need to be valid for 6 months beyond our stay? ===============

Source: http://www.us-passport-service-guide.com/do-passports-need-to-be-valid-for-6-months-for-trip-to-spain.html

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