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第 241 頁
apparently a shield volcano whose caldera is over 50 miles wide , and whose outer slopes are over 300 miles in diameter , and which stands about 90,000 feet above the surrounding plain . Some features may have been produced by cracking ...
apparently a shield volcano whose caldera is over 50 miles wide , and whose outer slopes are over 300 miles in diameter , and which stands about 90,000 feet above the surrounding plain . Some features may have been produced by cracking ...
第 387 頁
The 1990 center is 818.6 miles from the 1790 center of population , and 39.5 miles southwest of the 1980 center . Approximate location Year N. Lat . W.Long . • 1790 39 16 30 1800 1810 1820 1830 1840 1850 39 16 6 76 39 11 30 77 39 5 42 ...
The 1990 center is 818.6 miles from the 1790 center of population , and 39.5 miles southwest of the 1980 center . Approximate location Year N. Lat . W.Long . • 1790 39 16 30 1800 1810 1820 1830 1840 1850 39 16 6 76 39 11 30 77 39 5 42 ...
第 452 頁
44 ° 58′N . long . 103 ° 46'W . Contiguous U. S. ( 48 states ) Near Lebanon , Smith Co. , Kansas , lat . 39 ° 50'N . long . 98′35 ′′ W . North American continent - The geographic center is in Pierce County , North Dakota , 6 miles W of ...
44 ° 58′N . long . 103 ° 46'W . Contiguous U. S. ( 48 states ) Near Lebanon , Smith Co. , Kansas , lat . 39 ° 50'N . long . 98′35 ′′ W . North American continent - The geographic center is in Pierce County , North Dakota , 6 miles W of ...
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