Slipher first reports on the making the first Doppler measurement on September 17, 1912 in
The radial velocity of the Andromeda Nebula in the inaugural volume of the Lowell Observatory Bulletin, pp.2.56-2.57. In his report Slipher writes: "The magnitude of this velocity, which is the greatest hitherto observed, raises the question whether the velocity-like displacement might not be due to some other cause, but I believe we have at present no other interpretation for it." Three years later, Slipher wrote a review in the journal Popular Astronomy, Vol. 23, p. 21-24 Spectrographic Observations of Nebulae, in which he states, "The early discovery that the great Andromeda spiral had the quite exceptional velocity of - 300 km(/s) showed the means then available, capable of investigating not only the spectra of the spirals but their velocities as well." Slipher reported the velocities for 15 spiral nebula spread across the entire celestial sphere, all but three having observable "positive" (that is recessional) velocities.
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“Henry Draper Medal”. National Academy of Sciences. 2012년 7월 22일에 원본 문서에서 보존된 문서. 2011년 2월 24일에 확인함.
“Nesto (sic) Slipher, 93, Astronomer, Dies”. 《The New York Times》 (Flagstaff, AZ, 1969년 11월 10일에 출판됨). 1969년 11월 9일. 47면. ISSN1452424|issn= 값 확인 필요 (도움말).
