| Eduard Spelterini Pyramids of Gizah, Egypt. From left to right: Menkaure, Kephren, Cheops. Photographed from a balloon from about 600 metres above ground 1904, 21 November Gelatin silver print Creative Commons - Wikipedia LL/36378 E. Spelterini _ber den Wolken / Par dessus les nuages (Zurich: Brunner & Co, 1928), p. 88.
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