I found this article about an exhibit called, "Masters of American Comics" that is on exhibit in Lansing, MI right now. But they say that it's next stop, in mid March, is the Milwaukee Art Museum. It is being done in conjunction with a book of the same title that is currently available at Amazon.com and Barns & Noble. From the info in the article, the exhibit and book compliment each other, so if you have the money, and the interest, you might want to check out the book. Then this summer you can stop by the Milwaukee Art Museum (a worthwile trip anyway) and check out the exhibit.
The photo to the right is one piece that can be seen in the book & exhibit.