This bookstore is good. It's a lot smaller than many of the famous bookstore chains in the united states, but the diversity of their titles is actually quite amazing.
With a friendly cafe on the top level which is usually full at peak hours, this store is a good alternative in a place without too many casual bookstores. Inside Penn Book Center you will find overpriced apparel and a small, nifty computer store where you could also buy some items which might be hard to find around the area...
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