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: plumbing materials, sanitary fittings, house drainage, water supply to buildings, gas-fitting, heating and ventilation, steam heating, hot-water heating and fan systems of heating. No. 42. Published by the International Correspondence Schools, Ltd., 1910. First Edition. Half-bound faux leather hardback with gilt lettering to spine. Slight signs of wear to boards, marbled edges to pages. Decorated endpapers, tight binding. 9 chapters, with pages numbered within each chapter plus index pages i - xxvii. B/w illustrations and tables throughout.