This is a set of "Kagaku no Kiso Mondai Seikou" (Basic Chemistry Problem Mastery) and "Kagaku no Hyojun Mondai Seikou" (Standard Chemistry Problem Mastery). As far as I could see, there were no markings. There are no noticeable scratches other than the damage to the obi (sleeve) in the fourth photo, but please understand that some people may feel a slight sense of use. #Masaaki Kamata #Masaaki_Kamata #Kensaku Hashizume #Kensaku_Hashizume #Book #Nature/Chemistry