South gate of Chongqing Library. According to Hualong's query. Com, readers of Chongqing Library provide convenient book returning service, and a self-service book returning machine is added at the entrance of the south gate, so that readers who only need to return books can return books themselves without entering the library. Chongqing Library is located at No.0/06, Toyota Avenue, Shapingba District, Chongqing.