Coal

a solid mineralized vegetable matter that can be used for fuel. The entire coal area of the United States is about 200,000 square miles. But though the coal measures of the States are of vast extent there has been doubt whether the amount of workable coal is as great as has been stated. The coal areas of the United States are seven in number. They are: ‘The Ma achusetts and Rhode Island area, the Allegheny area, the Michigan area, the Illinois, Indiana, and Western Kentucky area, the Iowa, Mi ouri, Kansas, Arkansas, and Texas area, those of the Rocky mountains. and of the Pacisic Coast.