Ex 14.4, 3 - Production yield per hectare of wheat of 100
Modeling Change In Per Hectare Crop Yield Over Time | DataWim
File:Agricultural yields in key crops per hectare, 1961-2014, OWID.svg - Wikimedia Commons
Distinguishing between yield advances and yield plateaus in historical crop production trends | Nature Communications
Nigeria targets 10MT per hectare maize production by 2025 | The Guardian Nigeria News - Nigeria and World News — Business — The Guardian Nigeria News – Nigeria and World News
Crop Yields - Our World in Data
International Benchmarks for Wheat Production - Center for Commercial Agriculture