Help students discover the author's last name on a book's front cover and in the call number. This activity includes 36 cards (18 front covers and 18 matching spines/spine labels). Students look for the author's last name on the book's front cover card, then try to find the spine label card that contains a call number with the first three letters of that author's last name. With only the author's name to match, student focus on that part of the cover and call number. Cards are self-correcting with their matching colors. A great activity for centers or whole groups.