Excellent place you have shown on your post @alexvan, where should people spend their time much better than in a bookstore, and a place where you can find old books is more interesting. Leipzig seems to have a lot of history, doesn't it @alexvan? Besides, the bookstore seems to have a big variety of old books. Can I find some old books about chemistry issues out in that bookstore? If your answer is yes, I would spend whole days over there. Best regards from @presentnworldsc