Keywords: Ross Island topo excerpt 250k series ST 57 60 6 USGS 1960 Revised 1970.png en Topographic map of Ross Island Antarctica 1 250 000 scale 1970 http //mappery com/Ross-Island-Topo-Map http //usarc usgs gov/drgs/dir1/c77190s1 jpg USGS PD-USGov Uploaded with UploadWizard Maps of Ross Island |