Popular "Why? How come?" series 2nd Grade Version Easy to understand and engaging. Even parents can learn a lot from it. You'll want to collect the whole series. All 3 books come with covers. "Why? How come? Fun! The Wonders of Science for 2nd Graders" Tetsuya Murayama Price: ¥880 #TetsuyaMurayama #Tetsuya_Murayama #Books #Life/Hobbies & Entertainment "Why? How come? The Wonders of Society for 2nd Graders" Tetsuya Murayama Price: ¥930 #TetsuyaMurayama #Tetsuya_Murayama #Books #Life/Hobbies & Entertainment "Why? How come? The Wonders of the Heart" Tetsuya Murayama / Masato Ohno Price: ¥930 #TetsuyaMurayama #Tetsuya_Murayama #MasatoOhno #Ohno_Masato #Books #Life/Hobbies & Entertainment There are no markings, but there is a large fold on the first page of "The Wonders of the Heart." Please check photos 8 and 9. I'm selling these to fund the purchase of new books. Thank you for your cooperation! Please refrain from purchasing if you are sensitive to the condition of used items. Most orders are shipped the next day. Please contact me if you need expedited shipping. I offer a discount on shipping costs + α for bulk purchases. Please feel free to inquire if you are considering purchasing multiple items.