Reima Juhani Karppinen won a silver medal at what event that was held from August 30 to September 6 in 1981, at Oberschleibheim, outside Munich, Germany?
1981 World Rowing Championships: The 1981 World Rowing Championships were World Rowing Championships that were held from 30 August to 6 September 1981 at Oberschleißheim outside Munich, Germany.
i don't know