Morris, HM. 1973.
Impact 2:i-iv. CELD ID 3179|
The earth's surface is approximately 70% covered with water, which part is thus uninhabitable by man. The 30% of the earth occupied by land surfaces is not in one single land mass, but is stretched out in an odd shaped assortment of continents and islands, all of which are either inhabited or potentially habitable by man.