OTHER FUELS 



165 



Roman coins left by the soldiers 2000 years ago have been found 

 covered by 10 feet of peat. 



For use as a fuel peat is often dried and pressed into blocks. 



*/ POPULATION OFTHEWOfflD 

 OUTSIDE OF 'THE 

 UN/TED STATES 



POPULATION OF THE 

 UNITED STATES 



TOTAL COAL MINED IN THE 

 UNITED STATES PRIOR TO 



TOTAL COAL MINED IN THE WORLD 

 OUTSIDE. OF THt UNITED STATES 

 PRIOR TO 1913 



COAL RESERVE 



IN THE 

 UNITED STATES 



FIG. 1335. 



COAL RESERVE 

 IN THE 



WORLD OUTSIDE: 



OF THF. 

 UNITED STATES 



FIG. 133A. 



Courtesy of National Geographic Magazine 



FIG. 133C. Mining Coal. 



