Food and Agriculture Organization of the United Nations1987Investigation of lands with declining and stagnating productivity project : FAO/Government cooperative Programme
Thailand , Field document
7
Food and Agriculture Organization of the United Nations1987Investigation of lands with declining and stagnating productivity project : FAO/Government cooperative Programme
Thailand , Field document
6
Food and Agriculture Organization of the United Nations1986Investigation of lands with declining and stagnating productivity project : FAO/Government cooperative Programme
, Field document
4,10-11