National Transportation Atlas Database (NTAD): Major Ports 2013-Present Datasets
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下载链接：
https://rosap.ntl.bts.gov/view/dot/56578
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资源简介：
The ports are politically defined by port limits or Corps projects, excluding non-Corps projects not authorized for publication. The determination for the published Principal Ports is based upon the total tonnage for the port for the particular year; therefore the top 150 list can vary from year to year.
提供机构：
Bureau of Transportation Statistics
创建时间：
2021-07-21
