Регион: юрамалар арасында аерма

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CommonsDelinker (бәхәс | кертем)
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== Сылтамалар ==
* [Map and descriptions of hydrologic unit regions of the United States]
* [ftp://ftp-fc.sc.egov.usda.gov/NCGC/products/watershed/hu-standards.pdf Federal Standards for Delineation of Hydrologic Unit Boundaries]{{Deadlink|date=August 2021 |bot=InternetArchiveBot |fix-attempted=yes }}
* [http://tapestry.usgs.gov/physiogr/physio.html Physiographic regions of the United States]