Columbia subject headings:
Harvard subject headings:
Conservation tillage--Latin America--Congresses.
Soil conservation--Latin America--Congresses.
Soil degradation--Latin America--Congresses.
Soil productivity--Latin America--Congresses.
Sustainable agriculture--Latin America--Congresses.
Tillage--Latin America--Congresses.
Princeton subject headings:
Conservation tillage--Latin America--Congresses.
Soil conservation--Latin America--Congresses.
Soil degradation--Latin America--Congresses.
Soil productivity--Latin America--Congresses.
Tillage--Latin America--Congresses.