Paris: Gauthier-Villars, 1901. First edition. 8vo.,  198 pp., text illustrations, plus 15 large fold-out plates (diagrams, maps, photos, plans, topographical map). Newly bound in paper over boards with printed paper labels. Slight crease to the upper tip of the first 50 pages; a very good copy. Item #29031
Further investigations into the photogrammetric process, aerial and topographic measurements.