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WikiPedia: Babbage (miệng hố) http://planetarynames.wr.usgs.gov/ //doi.org/10.1007%2FBF00171763 http://host.planet4589.org/astro/lunar/ //tools.wmflabs.org/geohack/geohack.php?language=v... https://ui.adsabs.harvard.edu/abs/1971SSRv...12..1... https://archive.org/details/celestialobjects00webb https://archive.org/details/isbn_9780936389271 https://archive.org/details/patrickmooreonmo00patr