Children's short biographies and science books, with content suitable for each grade level. - Title: Biographies You Can Read in 10 Minutes, 3rd Grade - Title: Biographies You Can Read in 10 Minutes, 4th Grade - Title: Why? How? Science Stories - Title: Masterpieces You Can Read in 10 Minutes, 4th Grade Only the "Masterpieces You Can Read in 10 Minutes" book does not have a cover. The others show some signs of use on the covers, but the contents are relatively clean and can still be enjoyed. These are not sold separately and are offered at a low price. Please understand that these are used items stored by a private individual. Thank you for your understanding. Thank you for looking.