Photo courtesy of USDA NRCS.
Lettuce, in terms of production value, 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. April 2012 ... Lettuce
- Global Agricultural Trade System (GATS), Foreign Ag Service (FAS), USDA, 2010.
- Grocery Retailer Behavior in the Procurement and Sale of Perishable Fresh Products, Economic Research Service (ERS), USDA, 2003.
- High tunnel leafy greens and herbs, University of Kentucky Cooperative Extension Service, 2008.
- Iceberg Lettuce, Vegetables and Melons Outlook, ERS, USDA, 2006.
- 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 Handbook, Cornell University.
- Lettuce: How to Manage Pests, University of California.
- Lettuce: Romaine, Postharvest Technology, University of California, 2005.
- Production Guide for Organic Lettuce: 2010, Cornell University, 2011.
- Romaine Lettuce, Vegetables and Melons Outlook, ERS, USDA, 2005.
- Small-Scale Lettuce Production with Hydroponics or Aquaponics, University of Hawaii at Manoa, 2009.
- Specialty Lettuce & Greens: Organic Production, ATTRA, NCAT, 2002.
- U.S. Fresh Produce Markets: Marketing Channels, Trade Practices, and Retail Pricing Behavior, ERS Research Briefs, USDA, 2003.
- U.S. per capita food availability, ERS, USDA, 2008.
- Vegetables, Melons, and Pulses, ERS, USDA.
Links checked April 2012.