NOAA/PSL Catalog http://psl.noaa.gov/thredds/catalog/Datasets/20thC_ReanV2c/catalog.html

Dataset Size Last Modified
     Folder  20thC_ReanV2c   --
         Folder  Dailies/   --
         Folder  Derived/   --
         Folder  Monthlies/   --
         Folder  gaussian/   --
         Folder  gaussian_sprd/   --
         Folder  monolevel/   --
         Folder  monolevel_sprd/   --
         Folder  pressure/   --
         Folder  pressure_sprd/   --
         Folder  time_invariant/   --

NOAA/PSL at NOAA PSL see Info
THREDDS Data Server [Version 4.6.15-SNAPSHOT - 2020-01-28T04:01:10+0000] Documentation