Arctic Monitoring and Assessment Programme (AMAP): maps, environmental assessments, and many references and links to Arctic resources.
Arctic System Science (ARCSS) Data Coordination Center at NSIDC
Arctic Transitions in the Land Atmosphere System (ATLAS) data at the Joint Office for Science Support Other information
Global Change Master Directory: A directory of Earth science data.
Global Terrestrial Observing System (GTOS)
International Tundra Experiment (ITEX) data
Journal of Geocryology: full text of articles in native language with English summaries. Also includes several maps and many links to geocryological resources.
Permafrost and Climate in Europe (PACE)
Permafrost Research at the Geological Survey of Canada
UNEP.Net Arctic Portal: A directory of Arctic data, maps, publications, and other information.
World Data Center (WDC) System
See other Frozen Ground related information in NSIDC's "Coldlinks"