https://geodata.lib.berkeley.edu/catalog/osu-9593v662j
Hypsometric sketch of the United States - UC Berkeley GeoData
the united statesuc berkeleyhypsometricsketchgeodata
https://osm2cdr.com/formats/color-relief/
Convert OpenStreetMap to Color Relief / Hypsometric Tint (GeoTIFF) | OSM2CDR
Download professional Color Relief raster maps from OpenStreetMap data. Topographic maps, Atlases and posters, Geology and hydrology. Export in minutes.
convertopenstreetmapcolorreliefhypsometric