Fukushima Prefectural Museum in Aizu-Wakamatsu
I believe the museum might have given me a pamphlet when I arrived with English translations. Unfortunately, I can't find any of my Tohoku papers to see if I was able to keep it. I remember reading about the bus above and a few of the other more important items on display.
The nearest stop on the tourist loop bus is Tsuragajo Sannomaru, just outside the museum. The museum is open 9:30-17:00, closed on Mondays, days following national holidays, and at the end of the year. Admission to the permanent collection is 260 yen. They had a dinosaur special exhibition when I went but I didn't check it out.