Question: what are common book sizes?
Answer: Fiction: 4.25 x 6.87, 5 x 8, 5.25 x 8, 5.5 x 8.5, 6 x 9., Novella: 5 x 8., Children's: 7.5 x 7.5, 7 x 10, 10 x 8., Textbooks: 6 x 9, 7 x 10, 8.5 x 11., Non-fiction: 5.5 x 8.5, 6 x 9, 7 x 10", Memoir: 5.25 x 8, 5.5 x 8.5., Photography: Whatever you see fit!