Way History: 199979968

Added changes to U.S. time zone boundaries from 1967 to 1970

source	https://babel.hathitrust.org/cgi/pt?id=uc1.b2911071&seq=246
source:1	https://historical1-stg.arcgis.com/arcgis/rest/services/USGS_Historical_Topographic_Maps/ImageServer/

12 nodes

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