Part II

, p. 867). Of this amount the United States produced 335.3 million barrels or 66 per cent of the total. The second largest producer, Russia, and the third, Mexico, are credited with 69 million barrels and 55.3 million barrels respectively.

As a coal producer the United States stands far ahead of all other nations. The United States Geological Survey (_Special Report_, No. 118) placed the total coal production of the world in 1913 at 1,478 million tons. Of this amount 569.9 million tons (38.5 per cent) were produced in the United States. The production for Great Britain was 321.7 million tons; for Germany 305.7 million tons; for Austria-Hungary 60.6 million tons. No other country reported a production of as much as fifty million tons. In 1915 the United States produced 40.5 per cent of the world's coal; in 1917 44.2 per cent; in 1918 46.2 per cent.

Copper has become one of the world's chief metals. Two-thirds of all the copper is produced in the United States. Copper production in 1916 totaled 3,107 million pounds (_Mineral Resources in the United States_, 1916,