Columbia subject headings:
Agriculture and state--Mexico.
Agriculture--Economic aspects--Mexico--Yaqui River Valley.
Ejidos--Mexico--Yaqui River Valley.
Harvard subject headings:
Agriculture and state--Mexico.
Agriculture--Economic aspects--Mexico--Yaqui River Valley.
Ejidos--Mexico--Yaqui River Valley.
Princeton subject headings:
Agriculture and state--Mexico.
Agriculture--Economic aspects--Mexico--Yaqui River Valley.
Ejidos--Mexico--Yaqui River Valley.