The initial information comes from www.geonames.org, they occasionally stop to sharing as download so we are going to maintain an up to date with less columns from here. If you want to request to update any information please submit a ticket in the project.
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This work is licensed under a Creative Commons Attribution 3.0 License, see http://creativecommons.org/licenses/by/3.0/ The Data is provided "as is" without warranty or any representation of accuracy, timeliness or completeness.
check readme.txt located in data folder.