Home › Authors › Hisashi Kōketsu 👤 Hisashi Kōketsu b. 1955 · 3 books Books by Hisashi Kōketsu Gyōsei hanrei hyakusen Gyōsei hanrei hyakusen 2012 Kankyōhō nyūmon Kankyōhō nyūmon 2007 Kaishaku hōgaku to seisaku hōg Kaishaku hōgaku to seisaku hōgaku 2005