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

Dataset Size Last Modified
     Folder  Derived   --
         air.mon.1981-2010.ltm.nc 18.66 Mbytes 2012-12-17T23:33:33Z

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