Forget having just one library card! I have several library cards to different libraries in my state. Then again, I'm not quite normal and I do work in a library.
Right now on my desk I have two books over 100 years old on my desk (1892), a stack of Business Automation magazines from the 1960's, and some photography magazines from the early 1900's. I've also got a new book on stock options too cuz I wanted to read about that.
There's something for everyone! Libraries are truly a cool place if you like to learn things.