If you'd like to add multiple yearbooks to your order, start the purchase process for the first yearbook by clicking Own this yearbook today in the upper right hand corner, then Continue to checkout. After that, simply go back and locate the additional yearbook(s) you'd like to order, and click Own this yearbook today for each yearbook. All of the books will be added to your shopping cart, and you can complete the checkout process once you're ready.
If you'd like to order multiple copies of the same yearbook, simply update the quantity on the Shopping Cart page.