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Keywords from Image Description:
Topo. contour map of the thickness of the Earth's crust numbers in kilometres Konturierte Karte der Dicke der Erdkruste Zahlen in Kilometern Kontura mapo pri la dikeco de la tergloba krusto crust nombroj en kilometroj wr usgs gov USGS Free for all use Zum freien Gebrauch Je libera uzo PDUSGov Geophysical maps