A 112-page hardbound book measuring a mere 3 1/2 x 5" but with space for 439 entries, including plenty of room for fax numbers, cell phone numbers, and e-mail addresses. An elastic band bound into the back cover keeps the book firmly closed, so its pages won't be damaged by travel in a purse, pocket, briefcase, or backpack. ISBN: 978-07649-2529-0.