Michael Aubermann，one of the organizers of the free book exchange said.

　　The western city’ s latest public shelf was put up next to Bayenturm. It is the fourth free shelf that Aubermann’ s group，the Cologne Citizen’s Foundation，has placed outside.“We set up our other outdoor shelves last year and it’s been working really well，” said Aubermann. The public bookshelves，which are usually financed by donations and cared for by local volunteer groups，have appeared independently of each other in many cities，suburbs and villages. Each shelf holds around 200 books and it takes about six weeks for a complete turnover，with all the old titles replaced by new ones.

　　Even commercial book stores and online book sellers seem to support the idea of free book exchanges.“We see this project rather as a sales promotion than as competition，”said Elmar Muether.“If books are present everywhere，it helps our business，too.”

　　So far，the Cologne book group has had few problems with damage or other problems. Aubermann said，“Propaganda (宣传) is the only kind of literature we do not allow here.”

　　At another bookshelf in the Bayenthal neighborhood，the lower shelves are reserved for children’s literature only.“It is important that we make it easy for everyone to participate in this ‘reading culture on the street’—from old readers to kids to immigrants，”Aubermann said.

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