NOAA/ESRL/PSD Catalog http://www.esrl.noaa.gov/psd/thredds/catalog/Datasets/COBE/catalog.html

Dataset Size Last Modified
     Folder  COBE   --
         sst.mon.ltm.1981-2010.nc 1.582 Mbytes 2016-04-06T14:11:33Z
         sst.mon.mean.nc 158.5 Mbytes 2018-10-07T15:14:18Z

NOAA/ESRL/PSD at NOAA ESRL PSD see Info
THREDDS Data Server [Version 4.6.11 - 2017-12-04T16:22:46-0700] Documentation