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NGC 1721 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 1721" in English language version.

refsWebsite
Global rank English rank
1caltech.edu
887th place
714th place
1cseligman.com
low place
low place
1deepskypedia.com
low place
low place
1harvard.edu
18th place
17th place

caltech.edu

ned.ipac.caltech.edu

  • "NED results for object NGC 1721". NASA/IPAC Extragalactic Database (NED). Retrieved March 15, 2012.

cseligman.com

deepskypedia.com

harvard.edu

ui.adsabs.harvard.edu

  • Burnham, S. W. (1894). "Observations of nebulae with the 36-inch refractor of the Lick Observatory – by S. W. Burnham (Publications of the Lick Observatory)". Publications of Lick Observatory. 2: 168. Bibcode:1894PLicO...2..168B.