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收藏USACE GIS Open Data Portal2026-05-16 收录
下载链接：
https://geospatial-usace.opendata.arcgis.com/maps/8544d4938f06490299493f85db10b5e3
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资源简介：
A signboard used to indicate prohibitions, regulations, restrictions, recommendations and general information which apply to a waterway or a section of a waterway
提供机构：
US Army Corps of Engineers
