Home / Standards / CH 4001-1991 CH 4001-1991 Active 藏语[德格话]地名汉字译音规则 Standard Type CH40 ICS N/A CCS N/A Status Active Issue Date 1991-01-21 Implementation 1991-06-30 Centralized Committee 国家测绘局 Issuing Authority 国家测绘局