Land use map Wei He Valley, China, Shaanx̄i province / interpretation by: T. Woldai ; computer-assisted cartography: P. Stefanovic, K. Sijmons, T. WoldaiLand use map Wei He Valley, China, Shaanxi province / interpretation by: T. Woldai ; computer-assisted cartography: P. Stefanovic, K. Sijmons, T. Woldai