No publishing date offered, only that it is a new edition. 1920s? 1930s? The head of the spine is chipped, boards lightly shelf soiled, and the number 046294 stamped on the title page, else a clean, unmarked and solid copy. Raised bands with gilt print. Overseas customers please note the book weighs over a kilo and will attract additional postage. Full title: I.C.S. Reference Library: A Series of Textbooks Prepared for the Students of the International Correspondence Schools and Containing in Permanent Form the Instruction Papers, Examination Questions, and Keys Used in Their Various Courses. Road Construction; Street and Footways; Dams; Water Supply ;Purification of Water; Sewage Purification and Disposal.