The Congress of learned societies, Congress of the Society of Scientists at the Sorbonne in Paris 1869, Signed: Ettling, Fig. 101, p. 487, Ettling, Jacob (sc.), 1870, James Glaisher; Camille Flammarion; Wilfrid de Fonvielle; Gaston Tissandier: Voyages aériens. Paris: Hachette, 1870

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The Congress of learned societies, Congress of the Society of Scientists at the Sorbonne in Paris 1869, Signed: Ettling, Fig. 101, p. 487, Ettling, Jacob (sc.), 1870, James Glaisher; Camille Flammarion; Wilfrid de Fonvielle; Gaston Tissandier: Voyages aériens. Paris: Hachette, 1870

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