TOPS Computation Book, 11.75 x 9.5 Inches, Double Wire, 152 Numbered Pages, Quadrille Ruled, 76 Sheets, Buff, (35061) Quad-ruled, numbered pages make it easier to index projects for future reference Engineer's research and computation book is designed to help the busy professional record data and make calculations Quad-ruled, numbered pages make it easier to index projects for future reference