Surin Ongsuwan. (1991) Energy consumption in rice land preparation : a case study in central and northeastern regions of Thailand. Mahidol University,:ม.ป.ท.Surin Ongsuwan. 1991. Energy consumption in rice land preparation : a case study in central and northeastern regions of Thailand. ม.ป.ท.:Mahidol University,;Surin Ongsuwan. Energy consumption in rice land preparation : a case study in central and northeastern regions of Thailand. ม.ป.ท.:Mahidol University, 1991. Print.