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Global height data as polygons — Natural Earth doesn't have it?

I love the bathymetry data from Natural Earth. I've been looking for the last few days for the same basic data but for land. I'm trying to find general elevation shapefiles, as polygons. I don't need ...
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High Resolution Mineral Maps

Australia has recently published high resolution surface mineral maps using data from ASTER see here. Does anyone know of similar free products available for the entire globe?