| Eduard Spelterini The Al Ashraf mosque (center) and the Al Barkuk mosque (right) near Cairo, Egypt. Photographed from a balloon from about 800 metres above ground. 1904, 30 January Gelatin silver print Creative Commons - Wikipedia LL/36382 E. Spelterini Über den Wolken / Par dessus les nuages (Zurich: Brunner & Co, 1928), p. 87.
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