Yotsuya Otsuka Preliminary Series Social Studies Grade 5, Volume 1, 3 Books Set * Preliminary Series (with separate answer key and explanation booklet) * Exercise Problem Collection (with separate answer key and explanation booklet) * Applied Exercise Problem Collection (answers and explanations at the back of the problem book) These are from before the revision and were purchased about 6 years ago. I used the problems by copying them, so there are no markings. I apologize if I missed anything. There are signs of use such as being opened, creases, stains, and sun damage. Please understand that these have been stored at home. Thank you for your understanding. No returns or refunds, please.