A total of 50 book crossing shelves with 1500 selected books were set up at 16 Bus Rapid Transit stations of Anning District in Lanzhou City, Gansu Province, on July 26. Passengers can read these books for free while waiting for buses. Popular in 1960s and 70s in Europe, book crossing refers to the practice of deliberately leaving books in places where they will be found and read by other people. [Photo/Gscn.com.cn]