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2. H.H. Turner to R.S. Woodward, Oct 18, 1912 CIW Meridian Astrometry Director 1907–1926
3. Boss, Benjamin, 1912, Community of motion among stars of large proper motion,” AJ 27: 33;
4. Boss, Benjamin. 1912, “Systematic motion of the stars arranged according to type”, AJ, 27: 93
5. B. Boss to R.S, Woodward, Mar. 31, 1913, Meridian Astrometry, CIW