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Introduction to the Unified Modeling Language (PDF) by Terry Quatrani;
UML Tutorial in 7 days by Slobodan Kalajdziski;
Non-Software Examples of Software Design Patterns (PDF) by Michael Duell.
Official OMG UML site, but do not try to read the entire UML specification.
UML Totorial in 7 days by Slobodan Kalajdziski;