Start with this: Link Removed
Sorry for the crappy resolution, but they won't let anyone (except researchers have higher resolution - I've tried).
Second, google "[your state] feral hogs". Assuming your state has a feral hog problem (and it appears MI does), then 10 to 1 you'll find several articles on the MI hog problem. They will probably be written by your state wildlife biologists or equivalent. Simply google his name, then call or e-mail him at his work address and ask where to hunt feral hogs.
In Alabama, the F&G, WMA and National Forest people are all more than willing to help me find hogs - they want them gone bad! They may or may not know of some farmers who are willing to let you on their land to hunt also.
Good luck with porkies!