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Originally Posted by j.p.s
A New Guide to Science was published in 1960. What does his date of death have to do with it?
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Because he would have likely commented on it if he felt that Sagan had plagiarized from his book. One of the issues with history is that everyone uses more or less the same information, so it's not exactly shocking that two academics would end up using many of the same stories in history of science books. I suspect they likely used the same set of sources. You can see some of Sagan's references in the reference section of Cosmos.