This is a huge workbook to accompany the named textbook. The ISBN of the workbook matches the ISBN of the textbook (which is why I had to post it as though it has no ISBN). [ISBN-10: 0-7817-5217-5; ISBN-13: 978-0-78175217-6] I mailed this one today. For anyone who posts this in the future: it weighed 2 lbs. 7.4 oz.