File:El Salvador 1895 30c Seebeck essay green pair.jpg
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![File:El Salvador 1895 30c Seebeck essay green pair.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/78/El_Salvador_1895_30c_Seebeck_essay_green_pair.jpg/800px-El_Salvador_1895_30c_Seebeck_essay_green_pair.jpg?20190613193916)
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