Three copies. According to the query of official website of Central South University of Forestry and Technology, the school library is limited to borrowing three books at a time, and the next borrowing can only be started after all three books are returned. Central South University of Forestry and Technology (hereinafter referred to as "Central South University of Forestry and Technology") is located in Changsha, Hunan Province. It is a provincial university, a provincial key university and a "double first-class" construction project university in Hunan Province established by the State Forestry and Grassland Bureau and the Hunan Provincial People's Government.