PRODUCTION OF PHOSPHATE ROCK 3,000,000 IN FLORIDA
 1888-1922 - - -- - - - - - - - - 

 (LoNr. TONS)



 LEGEND ..L

 HARD ROCK WORLD WAR
 (EVRO PE) o 
 - - - - - - - - - - - - --- V )

 SOFT ROCK4


 LAN4D PE013LE



 RIVER PEBBLE

 - - - - - - - 4 - - - - - - - - - (7











 I~u 9 I a" 18 4d 839 1200 6202 1004 4906 /908 1340 132 94 91 91 l20 92