GERARDS (Emile) Underground Paris. Formation and composition of the soil of Paris. Underground waters. Quarries and catacombs. The sewers. Underground railways. Municipal metro. North-South electric railway. Various underground passages. Underground fauna and flora of Paris. Preface by M. Paul Weiss. Paris, Garnier frères, undated [1909]. In-4, publisher's red percaline with gilt decoration. It is illustrated with 17 colour plates (and not 19 plates as indicated in the title), 87 plans, sections and drawings in black, 2 stereoscopic views of the catacombs and more than 500 figures in the text. Includes interesting photographs of the construction of the metro. Wear and stains to boards, spine unstained.