A tip on finding things on one of the best search engines:
I just did a search on http://www.altavista.digital.com
first for ECOWAS and got a return on 500 documents
for SADC there are about 1000 documents starting with historical
reports from Kent State. If you want to skip past all these
reports to other sites then give as search string:
Of course, Kent may have other interesting reports so you might
substitute 'kent' with the name of the directory in which these
histories are found.
A search of AEC gives many other unrelated things so you should give:
"african economic community"
which returns hits only if it finds this particular sequence of words.
I got a hit on 86 documents.