University of Bristol - Historical Photographs of China reference number: Sw18-143. Khaki cloth Kodak Negative Album, 12 cm x 16 cm. 156 negatives (sized 3.25 inches x 5.5 inches, 92mm x 147mm). The album was later labelled P2/XI on the back cover. Peking (Beijing) Observatory (Guanxiangtai).
Black and white photograph
Archives & Special Collections, SOAS Library, University of London