LIETZ SINCE 1882 SURVEYING INSTRUMENTS, EQUIPMENT AND SUPPLIES • EDM Systems • Theodolites • Levels • Transits • Tripods • Rods • Hand Levels • Tapes • Planimeters • Accessories The paper in this book is a fine quality thick 50% rag ledger specially treated during the making to give "High Wet Strength." It retains its strength and writing surface when dried after having been subjected to extreme weather conditions.