Can anyone recommend good design patterns intro book?

Dear Experts,

Could anyone recommend a good tutorial book for someone (me) who already understands the basics of OOP, but wants to become more sophisticated in design?

I have heard about "Design Patterns" by Erich Gamma, et. al.  However, it's a "cook book".  (I'll certainly get it anyway...) I'm looking first for an introductory text, with some background theory and explanations.
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rrzConnect With a Mentor Commented:
I didn't read it but this one has been recommended
BrianMc1958Author Commented:
Thanks, folks!
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