N. LAT. 
39° 
3e8°4 
PERCENTAGE 
| 
{LLINOIS 
OF LAND IN SLOPES EXCEEDING FOU 
N THE OZARK PROVINCE AND ADJACENT AREAS 
age 88° W LONG 
75-100 
50-75 
|} 28-80 
= 
7 LESS 
THAN } 
GRADATIONAL 
BOUNDARIES 
RTEEN PER CENT 
0 50 190 
MILES 
"6 2INSLT 
—$40}9Dq advIspun'T joanjon Burddvpy pup Buazkjoup 
~ 
a 
IMMULOAT GAD 
