These are two books, one on chemistry and one on physics, published by Obunsha. There is no writing, including highlighting, in the books. They are used items, so there may be some wear and tear. Please purchase if you understand that they are used items. "Chemistry [Chemistry Basics/Chemistry] Standard Problem Mastery" Masaaki Kamata / Kensaku Hashizume ¥ 1595 "Physics [Physics Basics/Physics] Standard Problem Mastery" Masao Nakagawa / Kazuhiko Tamechika ¥ 1595 #MasaoNakagawa #Masao_Nakagawa #KazuhikoTamechika #Kazuhiko_Tamechika #book #nature/physics