Fabrikoid cover Case bound w/ sewn-in pages White paper color 160 pages / 80 sheets 10 environmental reference pages, imperial & metric rulers, conversion table, map scale The durable and regal fabric cover endures the onslaught of the elements as well as the slow, insidious passage of time. Equipped with environmental reference material and numbered pages this book not only helps optimize your data but meets US EPA Guidelines. Built to withstand the test of time, these case bound books have secure sewn-in pages which lay flat when open.