2011-03-252011-03-258-6-99 8:22002https://hdl.handle.net/1911/58721The origin of the image is Domestic. Watermark Unknown.DrawingDomesticBeijing Metro Safety Warning,metrosafetye02bmetrosafetye02b以免发生危险； [To avoid the danger. ]Metro ServicePublic Service AdsBeijing Metro Safety Warningnewspapers [报纸]