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Are the Public Land Survey System (PLSS) section lines on US Topo maps a legal record?

US Topo maps are not legal documents and the Public Land Survey System (PLSS) representation is not legally authoritative.

The sections, townships, and ranges of the PLSS that are shown on US Topo maps are derived from GIS data from the Bureau of Land Management (BLM) in cooperation with the Federal Geographic Data Committee (FGDC). 

Learn More: FGDC Cadastral Subcommittee (information and links)