The domain michiganorganic.org belonged to Organic Growers of Michigan, which was active 1973-2006. Its successor organization is Michigan Organic Food and Farm Alliance. The History page at moffa.net contains some information about OGM.
In the summer of 2010, OGM founding members Maynard Kaufman and Judy Yaeger sat down to talk about the origins of Organic Growers of Michigan. You can watch the video here.
On May 26, 2017, MOFFA published the book The Organic Movement in Michigan, which contains a wide variety of information: historical summaries of the major organic organizations over the past 45 years, reports on various organic activities, and essays about the past, present and future of organic farming.