File:East Germany 5 mark 1968 Robert Koch.jpg
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![File:East Germany 5 mark 1968 Robert Koch.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ad/East_Germany_5_mark_1968_Robert_Koch.jpg/800px-East_Germany_5_mark_1968_Robert_Koch.jpg?20100403024637)
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