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Mathematics
History
Agricultural Systems
All Subcategories (14)
Effects of the three-field system
Efficiency of Labor and Energy Input
Encomienda
Input Efficiency
Input of Labor and Energy
Labor and Energy Efficiency
Labor and Energy Input
Labor Systems
Landownership and Labor
Methods of farming
Sharecropping
Sharecropping and Tenant Farming
Sharecropping System
The Three Field System
Parent Categories (7)
Agriculture
Economic Systems
Economics
History
History and Economics
Social Studies/Economics
U.S. History