I'm selling these old books in case anyone needs them! Technical Instruction Heat Treatment Operations Edited by Gijutsu Shido Netsu Shori Sagyo Ginen Kyoiku Kenkyukai, published by Kogaku Tosho Publishing Co., Ltd. High-Pressure Gas Manufacturing Safety Supervisor, Class C Chemical Examination Question Collection - General High-Pressure Gas, High-Pressure Gas Safety Association Pass with This! Important Question Collection for Hazardous Materials Handler, Shinsei Publishing Heat Treatment in the Field, edited by Shigeo Yamakyu Crane Safety Regulations, Comparison of Labor Safety and Health Law Related Ordinances and Articles Hazardous Materials Handler Examination Questions, Class 4, The National Hazardous Materials Safety Association