Science picture book set for elementary school grades 1-3. - Series Name: Why? How? 1st Grade, 2nd Grade, 3rd Grade - Author: Fun Science Creatures - Target Age: Elementary school grades 1-3 - Contents: Picture books that answer questions about science - Number of Books: Set of 3 books The cover of the 3rd grade book has a fold and some dirt. Please refrain from purchasing if you are concerned about the condition, as this is a used item. Thank you for looking.