https://www.usgs.gov/faqs/are-there-metadata-files-usgs-topographic-maps
Are there metadata files for USGS topographic maps? | U.S. Geological Survey
GeoPDF files for both Historical Topographic maps (produced 1884-2006), US Topo maps (produced 2009-present), and OnDemand Topo maps come with an XML metadata...
usgs topographic maps