137
Cs ody B
| urden Miistory for
Dicimd Youths
Mean and Range vs. Time
e<
qT
100 }—-
10 -—
Maximum Permissible Burden.
3
i
ee ee omen ee eee ee ee eee oe nd
24 JAN. 1980
= 4.0
c
zz
|
oS ob
o
|
|
|
oOa
|
°
|
|
0.01
|
{
|
4)
L
|
0.001 |—
|
|
|
1977
April
elf Fo to
1978 Depart 13798 1979
April Bikini Jan, May