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                <text>Hubble wrote to Slipher to inform him that Mount Wilson was constructing a catalog of radical velocities of extragalactic nebulae and their dispersement. And as such, if Slipher would send them the numbers of plates and dispersions in his own catalog to fill out Mount Wilson's. A list of known Slipher velocities was enclosed to assist the process.</text>
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                <text>Slipher, in response to Hubble's query, confirms that he has been using a spectrograph to observe nebula rotation and velocity but had to change out the lens. Meaning that he had to wait a time to confirm its efficiency. But he had not yet published his results of the stars Hubble specified and would get back to him on those stars after remeasuring the plates.</text>
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                <text>Hubble contacted Slipher to ask if the report he had heard of Slipher observing spectrographic rotations of nebulae was true and, if so, how the work was going. Especially if he had published any of his findings, observing that there was a significant need for Spectrographic observations and that duplication was undesirable. He also inquired about specific stars and that he had observed a different rotation velocity on one particular star.</text>
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