I got to check out the ones my folks ordered tonight, and I wondered about that. It is put together as a book, 9"x7", saddle stitched. Looking at the link, that's how it's described as well.
http://www.lulu.com/shop/ian-stead/official-2013-traveller-calendar/paperback/product-20577624.html
http://www.lulu.com/shop/ian-stead/official-2013-traveller-calendar/paperback/product-20577624.html