Daniel PomarèdeCosmography archives
1934, the double supergalaxy in Hercules, by Harlow Shapley
An early evidence of the Hercules Supercluster of galaxies
https://doi.org/10.1093/mnras/94.9.791
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On Some Structural Features of the Metagalaxy. (George Darwin Lecture, delivered by Dr. Harlow Shapley, Assoc. R.A.S., on 1934 May 11.)
On Some Structural Features of the Metagalaxy. (George Darwin Lecture, delivered by Dr. Harlow Shapley, Assoc. R.A.S., on 1934 May 11.), Monthly Notices of