Wolverine Junior A Hockey League was a hockey league that was based in Michigan and played from 1972 to 1975. The league merged with the Michigan Junior Hockey League to form the Great Lakes Junior Hockey League, which eventually became the North American Hockey League.
Teams that played are
1972-73: Oak Park, Southfield, Trenton
1973-74: Flint, Kalamazoo, Livona, Oak Park, Southfield
found at this webiste site: en.wikipedia.org/wiki/List_of_ice_hockey_teams_in_Michigan