I balanced the wheels/tires as Merc Man outlined. However I noticed that the hub with brake drum was rotating on its own. I stuck 1.5 ounces of weights on the drum to balance it, equivalent to 3/4 ounce at the wheel rim.
So, even with perfectly balanced wheels they could still be out of balance if the drums are not balanced. I seem to remember steel weights spot welded to brake drums in the past.
The stick on weights will not stay on the drum so they got removed. So the wheel on that corner is 3/4 ounce out of balance. I drove the car and did not notice it.