Sri Lanka (Ahungalla: 1986)
Proceedings of a workshop on farming systems research and extension in Sri Lanka - Ahungalla USAID Diversified Agricultural Research Project 1924 - 224 pages
Farming systems
631 / WOR
Proceedings of a workshop on farming systems research and extension in Sri Lanka - Ahungalla USAID Diversified Agricultural Research Project 1924 - 224 pages
Farming systems
631 / WOR