Way History: 199989679

Added changes to U.S. time zone boundaries from 1919 to 1923

description	All municipalities located upon the above-described zone boundary line shall be considered as within United States standard Mountain time zone.
source	https://books.google.com/books?id=WyYXAQAAMAAJ&pg=PA297
source:1	https://historical1-stg.arcgis.com/arcgis/rest/services/USGS_Historical_Topographic_Maps/ImageServer/

6 nodes

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