I don't know about the library, but with some search I found a question similar to yours: http://answers.google.com/answers/threadview/id/207899.html
The FedEx, UPS, USPS, and AIRBORNE formats are described very well, and itβs easy to write some static methods in the class to test for them. But you did not indicate which media you want to find, in which country, etc., So this may not be very useful.
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