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farming systems --- farming systems --- Traditional farming --- Traditional farming --- land use --- land use --- socioeconomic organization --- socioeconomic organization --- Subsistence farming --- Subsistence farming --- Valleys --- Valleys --- Rural sociology --- Rural sociology --- History --- History --- Food crops --- Food crops --- nomenclature. --- nomenclature --- Latin --- Towga --- Gwembe valley --- Zambia --- Zambia --- Latin --- Towga --- Gwembe valley