Lettuce, believed to be one of the first vegetables brought to the new world by explorer Christopher Columbus, has been grown in the United States since colonial times (California Lettuce Research Board). In the early 1900s, the iced shipping industry developed in the western states, expanding the range and popularity of lettuce. Today, in terms of production value, it is the leading vegetable crop in the United States. More than 90 percent of U.S. lettuce production is located in California and Arizona. The main varieties include iceberg, romaine and various leaf varieties. October 2005 . . . Lettuce
- Commodity Reports, National Agricultural Statistical Service (NASS), USDA.
- Estimating Per Capita Domestic Use of Head Lettuce, Amber Waves, ERS, USDA, 2003.
- Foreign Agricultural Trade of the United States, ERS, USDA.
- Grocery Retailer Behavior in the Procurement and Sale of Perishable Fresh Products, ERS, USDA, 2003.
- Iceberg and Leaf Lettuce, University of California Cooperative Extension.
- Iceberg Lettuce, Vegetables and Melons Outlook, ERS, USDA, 2006.
- Iceberg Lettuce, University of California, 1997.
- Iceberg Lettuce Production in California, University of California Cooperative Extension.
- Leaf Lettuce Production in California, University of California.
- Lettuce, University of California.
- Lettuce: Crisphead or Iceberg, Postharvest Technology, University of California, 2006.
- Lettuce: Romaine or Cos, Postharvest Technology, University of California, 2005.
- Recent Changes in Marketing and Trade Practices in the U.S. Lettuce and Fresh-Cut Vegetable Industries, ERS, USDA, 2001.
- U.S. Fresh Produce Markets: Marketing Channels, Trade Practices, and Retail Pricing Behavior, ERS Research Briefs, USDA, 2003.
- Vegetables, Melons, and Pulses, ERS, USDA.
- Wild Pigs in California: The Issues. Marcia Kreith. AIC Issues Brief No. 33, December 2007. The story of the wild pig in California, its economic and environmental impacts and evolving policy concerns.
Links checked February 2008.