Subject: What are the vitamins/minerals/elements in a butterhead lettuce?

I'm a 13 yr old student from Singapore and I like to know what kind of 
vitamins,minerals and elements found in a butterhead lettuce as my group 
and I are doing a project on the different kinds of plant agriculture 
growth and the nutritional level of their plants. We were not able to  
find the vitamins, minerals and elements in a butterhead lettuce. Can you 
pls give us some websites that provide the information we need? Pls reply 
soon as we need it very urgently.

Re: What are the vitamins/minerals/elements in a butterhead lettuce?