Iceberg is America's favorite salad green. 30 lbs. per person is consumed yearly. It is mostly water, and has a lower nutrient value than darker leaved greens. It is cool and crisp and green, and is the best lettuce for a Cobb salad, or a BLT. It is a member of the heading type of lettuce, and it is very mild in flavor. It comes packed 24 heads per case, and can come cleaned and cored, and is the lettuce used for most pre-trimmed and processed lettuce for salads. 

When pre-trimmed, cleaned and cored, the yield is approx. 95%. Plan on4 to 6 servings per head of lettuce. 

Iceberg lettuce is free of fat and cholesterol, is very low in sodium,
and is also low in calories. Diets low in sodium may reduce the risk of high blood pressure, the development of which is dependent upon many factors.
Iceberg lettuce is very low in sodium!

Try these websites about Iceberg lettuce: 
http://www.5aday.com/iceberglettuce.html

Dole Food Company http://www.dole5aday.com 
The Nunes Company, Inc. http://www.foxy.com 
Misionero Vegetables http://www.misionero.com