月球地质史, 1987, Donald Wilhelms;with sections by McCauley, John F.; Trask, Newell J. USGS Professional Paper: 1348. Figure 3.9 A (online (页面存档备份,存于互联网档案馆))
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月球地质史, 1987, Donald Wilhelms;with sections by McCauley, John F.; Trask, Newell J. USGS Professional Paper: 1348. Figure 3.9 A (online (页面存档备份,存于互联网档案馆))