Unemployment rarest and employment characteristics :  far scientists and engineers 1971 / 
United States, National Science Foundotion 
 - Washington, D.C. :  U.S. National Science Foundotion.,  1971 
 - xviii, 193 p. :  , chart ;  26 cm. 
<br/><br/> NSF 72.307 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Unemployment--United States<br/>Labor supply--United States
<br/><br/><label>Dewey Class. No.: </label>331.137973