by International Affairs Commission of The Japanese Society of Irrigation, Drainage and Reclamation EnginneringJapanese Society of Irrigation, Drainage and Reclamation Engineering1995
by International Affairs Commission of The Japanese Society of Irrigation, Drainage and Reclamation EnginneringJapanese Society of Irrigation, Drainage and Reclamation Engineering1989
by International Affairs Commission of The Japanese Society of Irrigation, Drainage and Reclamation EngineeringJapanese Society of Irrigation, Drainage and Reclamation Engineering1989