Columbia subject headings:
Agricultural innovations--Yemen (Republic)
Agricultural productivity--Yemen (Republic)
Agriculture--Yemen (Republic)
Yemen, South--Rural conditions.
Harvard subject headings:
Agricultural innovations--Yemen, North.
Agricultural productivity--Yemen, North.
Agriculture--Yemen, North.
Yemen, North--Rural conditions.
Princeton subject headings:
Agriculture--Economic aspects--Yemen--Ṣanʻāʾ Region.
Agriculture--Social aspects--Yemen--Ṣanʻāʾ Region.
Ṣanʻāʾ Region (Yemen)--Economic conditions.
Ṣanʻāʾ Region (Yemen)--Social conditions.