Founded in 1887 by D.M. Bare, Roaring Spring Paper Products has been an integral part of the Roaring Spring community for more that 130 years. Employing over 200 people, the company prides itself on remaining a family-owned, American small business. This book is ideal for use in labs and science classes. The carbonless paper has a white original sheet and blue copy sheet. Both sheets are printed with 4 square/inch graph layout. The book includes a removable backer for positioning under the blue sheet to prevent bleed through. Sets are consecutively numbered 1-50 The front covers is made from durable 20 pt white board, , and the back is 30 pt grey chipboard. The book is stapled and taped along the 8″ side. There are 50 sets per book. Proudly made in USA!