1st) start here:Our "map" doesn't have easy lines....how far do I need to look?
I need help with this or an extra set of eyes...
https://www.usgs.gov/core-science-systems/national-geospatial-program/topographic-maps
Then….. play here:
https://www.usgs.gov/core-science-systems/ngp/tnm-delivery/topographic-maps