Real Estate Investment Trust Index

I’d like to invest in an american REIT but I’ve been unable to find a comprehensive index of the different options. Is there a publication I can buy that will give me info on most/all american REITs? What about a website that lists them? Google hasn’t been good to me but maybe my keywords are wrong.

Thanks.

NAREIT:

http://www.nareit.com/index.cfm

You can get a some information, including their monthly “reitwatch” without membership:

http://www.nareit.com/library/performance/reitwatch.cfm