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Photographing Comets

E. E. Barnard
1909 Scientific American  

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doi:10.1038/scientificamerican12181909-398supp fatcat:jbvv5aeuija7hhwhftxrt5yp7m
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E. E. Barnard. "Photographing Comets." Scientific American 68.1772supp (1909) 398-399