Prevalence of selected chronic respiratory condition :  U. S. 1970 / 
United States, Department of Health, Education and Welfare 
 - Washington, D.C. :  The Department,  1973 
 - 49 p. ;  23 cm. 
<br/><br/> Data from national health survey 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Respiratory organs--Diseases
<br/><br/><label>Dewey Class. No.: </label>616.2