Khan Academy
Khan Academy: Activity: Comparing Crops
Take a closer look at some of the earliest farming civilizations and the plants and animals they domesticated. This quick exercise using the Agriculture and Civilization Infographic has you consider the regional differences in...
Curated OER
Wikipedia: Natl Historic Landmarks in South Carolina: Coker Experimental Farms
Site of crop-improvement experiments that "played a great role in the agricultural revolution of the South".
Curated OER
Wikipedia: National Historic Landmarks in Minnesota: Oliver H. Kelley Homestead
The Oliver H. Kelley Homestead is a historic farmstead once owned by Oliver Hudson Kelley, one of the founders of the Order of Patrons of Husbandry. Oliver Kelley moved to Minnesota in 1849, the year that Minnesota Territory was formed....