Published by Vapor Car Heating Co. , Inc. ca. 1947, Chicago, 1947
School Binding. Condition: Fair. Bound in two post fastener report binder. Typewritten text, printed one side only. Fold-out test chart in rear, followed by single sheet schematic in color, then a large folded Vapor Zone Loop Cycle scematic. Company name in gilt on front cover. Covers torn at the spine, top and bottom, as well as the edges. ; 4to 11" - 13" tall; 11 pages.