 Principal Centers of Origin of Cultivated Plants |
 Plowing and broadcast sowing, United States |
 Gathering food, western Asia |
 Threshing with flails, Europe
|
 Gathering cow-lily pods, Klamath Lake, Oregon |
 Harvesting sugar cane, Brazil |
 Papuan planting taro, New Guinea
|
 Trade caravan north of the Persian Gulf
|
 Women grinding corn in ancient Mexico
|
 Early French coffee buyers, Yemen |
 Women preparing to plant their fields, south central Africa |
 Wholesale vegetable market in the city
|
 Potato planting, Peru
|
 Open air market, Mexico
|
 Rice growing, Philippines |
 Ancient Trade Routes of the World |
 Olive press, Northern Africa |
 Winemaking in the Valley of Tyrol, Bavaria |
