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Cometography.com: C/1843 D1 (Great March Comet)
This site provides a detailed overview of the comet C/1843 D1 (the great march comet of 1843). Content includes discovery, orbit, and observational information.
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Cometography.com: C/1861 J1 (Great Comet of 1861)
This site provides a detailed discussion of the comet C/1861 J1 (the great comet of 1861). Content includes discovery and observational information, as well as images.