Paris: Gauthier-Villars et Fils, 1888. First edition. Small 8vo., vi, 29  pp., plus 4 pp. adverts. Plain stiff paper wrappers with publisher's label, possibly a remainder issue. A near fine copy, unopened. Item #27003
Explains the use of silver, iron salts, and potassium bichromate in making of photographic reproduction of prints, maps, drawings, etc.
Roosens and Salu No. 9245. OCLC locates eleven copies.