Geographical mobility. 

 - Washington, D.C.  Bureau of the Census  1976- 
 - v.  28 cm. 
 - 
 - Current population reports .
<br/><br/><label>Source: </label>003-001-90776-3 
<br/><br/><label>LCCN: </label>gp 83012850  
<br/><br/><label>GPO Item No.: </label>142-C-1 
<br/><br/><label>Gov. Doc. Class. No.: </label>C 3.186:P-20/