The epidemiology of severe intellectual impairment :
Fryers, Thomas.
The epidemiology of severe intellectual impairment : the dynamics of prevalence / Tom Fryers. - London : Academic Press, 1984. - 244 p.
0122693809
Mental retardation--epidemiology.
WM 300
The epidemiology of severe intellectual impairment : the dynamics of prevalence / Tom Fryers. - London : Academic Press, 1984. - 244 p.
0122693809
Mental retardation--epidemiology.
WM 300