Question
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What is the local Extention and where is it that you mentioned in our last correspondence.  JJ

Answer
For you it would be the Illinois University Extention service.  I looked up their web site address. You could find and phone number and address from this site.

http://wwww.urbanext.uiuc.edu/greenlline/01v1/02.html

You can also find it by putting Illinois University Extention in your search engine. That will give you the home page.  The address above is for an article on raised beds.
They are experts on the gardening conditions in your area. They have a huge resourse of information on gardening. They are an experiment station, which means they are studing ways to get better gardening results in your area.
They have classes and tours. They are there to answer your questions.

bakerplanter