LSE4332252 Observation at theodolite, Dr Crevaux with his measuring instruments and his team of guide and porters, in full working session, engraving after a drawing by Riou, to illustrate the story De Cayenne aux Andes, by Jules Crevaux, doctor of the French navy, in 1878-1879, published in the tour du monde, under the direction of Edouard Charton, 1880, Paris. Selva Collection. by Riou, Edouard (1833-1900); Private Collection; (add.info.: Observation at theodolite, Dr Crevaux with his measuring instruments and his team of guide and porters, in full working session, engraving after a drawing by Riou, to illustrate the story De Cayenne aux Andes, by Jules Crevaux, doctor of the French navy, in 1878-1879, published in the tour du monde, under the direction of Edouard Charton, 1880, Paris. Selva Collection.); Photo by Leonard de Selva.