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Valhalla Valhalla (hố va chạm) Valhalla (phim 1986) Valhalla, Quận Wells, Bắc Dakota VauhallanTài liệu tham khảo
WikiPedia: Valhalla (hố va chạm) http://lasp.colorado.edu/icymoons/europaclass/Spoh... http://lasp.colorado.edu/~espoclass/homework/5830_... http://www.lpi.usra.edu/meetings/lpsc2001/pdf/1818... //doi.org/10.1016%2FS0019-1035(02)00048-9 //doi.org/10.1016%2FS0032-0633(00)00050-7 //doi.org/10.1029%2F95JE01855 http://www.scienceandsociety.co.uk/results.asp?ima... https://ui.adsabs.harvard.edu/abs/1995JGR...100190... https://ui.adsabs.harvard.edu/abs/2000P&SS...48..8... https://ui.adsabs.harvard.edu/abs/2001LPI....32.18...