Engineer's research & computation book is designed to help the busy professional record data & make calculations. Sheets are numbered 1 to 156 & are ruled with four squares per inch on front & back with top & side margins for note-taking. Quad-ruled, numbered pages make it easier to index projects for future reference. Heavyweight buff paper will stand up to heavy use & erasures. The buff color helps reduce any eyestrain. Pressboard covers protect contents. Coil-lock wire binding prevents snagging & keeps contents secure. Notebook contains 76 sheets with 152 numbered pages.