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==Libraries and Tools==
==Data==
* [https://www.census.gov/programs-surveys/cfs.html US Commodity Flow Survey]: Commodity flows as surveyed by the US Census Bureau every 5 years.
* National and sub-national agencies report traffic counts at different spatial and temporal resolutions, e.g. [https://www.bast.de/BASt_2017/DE/Verkehrstechnik/Fachthemen/v2-verkehrszaehlung/zaehl_node.html Germany] or [http://pems.dot.ca.gov California]
==References==
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