The newspaper contention would be that the College took the photos for PR purposes and I am sure that the PR lady at the school did not indicate that there were any "strings" or conditions attached to their use, possibly because she was not even aware of your wish for credit.

Put it down to a learning experience and don't give away photos or at the very least put them on a contact sheet or in some other limited use form....but definitely not in original quality. That way someone has to come back to you, if they want to use them for a large print etc.

Ronnoco