Engineer's research and computation book is designed to help the busy professional record data and make calculations. Sheets are numbered 1 to 156 and are ruled with four squares per inch on front and back with top and 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 and erasures. The buff color helps reduce any eyestrain. Pressboard covers protect contents. Coil-lock wire binding prevents snagging and keeps contents secure. Notebook contains 76 sheets with 152 numbered pages.