Edwin Hubble found 140 nebulous objects in the vicinity of M31 that were provisionally identified as globular clusters, his paper on the subject was published in the Astrophysical Journal, vol. 76 (1932), p.44-69. It can be found in SAO ADS. I would post a link, but this forum truncates the web address making it unreachable.
British Astronomical Association
Supporting amateur astronomers since 1890
