 | 1909 - 852 pages
...158,610,000 166,441,000 173,399,000 180,531,000 191,782,000 202,973,000 215,446,000 227,672,000 263,281,000 in production, the 1,382,780,000,000 tons available...the year 2027, and all coal by the middle of that centur}-. It is recognized that the data upon which this curve has been constructed are few, and that... | |
 | William R. Calvert - Coal - 1909 - 556 pages
...of increase will indicate the constantly diminishing rate of increase for the successive twenty-year periods. The result obtained by this method is that...which this curve has been constructed are few and the curve correspondingly weak. However, in the above estimate all of the data have been given which... | |
 | United States. National Conservation Commission - 1909 - 862 pages
...of increase will indicate the constantly diminishing rate of increase for the successive twenty-year periods. The result obtained by this method is that...which this curve has been constructed are few and the curve correspondingly weak. However, in the above estimate all of the data have been given which... | |
 | United States. National Conservation Commission - Natural resources - 1909 - 870 pages
...of increase will indicate the constantly diminishing rate of increase for the successive twenty-year periods. The result obtained by this method is that...which this curve has been constructed are few and the curve correspondingly weak. However, in the above estimate all of the data have been given which... | |
 | Geological Survey (U.S.) - Geology - 1909 - 248 pages
...of increase will indicate the constantly diminishing rate of increase for the successive twenty-year periods. The result obtained by this method is that...which this curve has been constructed are few and the curve correspondingly weak. However, in the above estimate all of the data have been given which... | |
 | Crittenden Marriott - United States - 1911 - 400 pages
...Exhaustion of Minerals. — First comes the question of our mineral resources. The report says : " The easily accessible and available coal will be exhausted...2027, and all coal by the middle of that century." Coal, therefore, will last us perhaps one hundred and fifty years longer, but long before that time... | |
 | American Railway Engineering Association - Railroad engineering - 1912 - 1252 pages
...rates of increase will indicate the constantly diminishing rate of increase for the successive 2O-year periods. The result obtained by this method is that...which this curve has been constructed are few and the curve correspondingly weak. However, in the above estimate all of the data have been given which... | |
 | American Railway Engineering Association - Railroads - 1912 - 1258 pages
...rates of increase will indicate the constantly diminishing rate of increase for the successive 2O-year periods. The result obtained by this method is that...which this curve has been constructed are few and the curve correspondingly weak. However, in the above estimate all of the data have been given which... | |
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... periods. The result obtained by this method is that the easily accessible and available coal will be exhausted about the year 2027, and all coal by the middle of that century. 