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The Freedom of Science in the Modern State: a Discourse Delivered at the Third General Meeting of the Fiftieth Conference of the German Association of Naturalists and Physicians at Munich, on the 22nd of September, 1877
出版J. Murray, 1878
URLhttp://books.google.com.hk/books?id=A6wIAAAAIAAJ&hl=&source=gbs_api
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