https://www.gml.noaa.gov/data/dataset.php?item=sxf-surfrad-month-2011
Dataset SXF surfrad - NOAA Global Monitoring Laboratory
Surface Radiation measurements at Sioux Falls, South Dakota, United States
global monitoringdatasetsxfnoaalaboratory
https://doi.pangaea.de/10.1594/PANGAEA.718273
Deluisi, J (2009): Other measurements at 10 m from station Boulder, SURFRAD (1995-10)
Deluisi, John (2009): Other measurements at 10 m from station Boulder, SURFRAD (1995-10) [dataset]. NOAA - Air Resources Laboratory, Boulder, PANGAEA,...