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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1916 Jul;2(7):386–390. doi: 10.1073/pnas.2.7.386

Preliminary Evidence of Internal Motion in the Spiral Nebula Messier 101

A van Maanen 1
PMCID: PMC1091042  PMID: 16576174

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