Napaporn Wongpokhom. (2007) Variability of natural soil systems as affected by salinity levels in Thailand /. Kasetsart University,:ม.ป.ท.Napaporn Wongpokhom. 2007. Variability of natural soil systems as affected by salinity levels in Thailand /. ม.ป.ท.:Kasetsart University,;Napaporn Wongpokhom. Variability of natural soil systems as affected by salinity levels in Thailand /. ม.ป.ท.:Kasetsart University, 2007. Print.