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EarthExplorer Help Index is now located at: https://www.usgs.gov/centers/eros/science/earthexplorer-help-index

GloVis Help Index is now located at: https://www.usgs.gov/centers/eros/science/glovis-help-index

HDDS Explorer Help Index is now located at: https://www.usgs.gov/centers/eros/science/hdds-explorer-help-index

All Data Dictionaries have been moved to the USGS site, usgs.gov or https://www.usgs.gov/search?keywords=data+dictionary

If you have any further questions, please contact the helpdesk as custserv@usgs.gov