| Title | On the tendency of species to cause varieties |
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| Author | Charles Darwin and Alfred Wallace |
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| Year | 1858 |
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| Publisher | Proceedings of the Linnean Society vol 3 |
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| Source | pdf |
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| Progress | DoneāAll pages of the work proper are validated |
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| Transclusion | Fully transcluded |
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| Validated in | October 2013 |
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