United Nations, International Economic and Social Information and Policy Analysis (Deptt of-) <br/><br/>
Handbook of population and housing censuses. 

 - New York  UN           1996 
<br/><br/> Pt 4 : Economic activity status.98p 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5.1.N7, N6.4/UN