NOAA/ESRL/PSD Catalog http://esrl.noaa.gov/psd/thredds/catalog/Datasets/20thC_ReanV2/time_invariant/catalog.html

Dataset Size Last Modified
     Folder  time_invariant   --
         hgt.sfc.nc 36.24 Kbytes 2012-01-23T16:23:26Z

NOAA/ESRL/PSD at NOAA ESRL PSD see Info
THREDDS Data Server [Version 4.3.15 - 20121218.1126] Documentation