Comparability ratios based on mortality statistics for the fifth and sixth revisions 

 - Washington, D.C. :  Department of health, education, and welfare,  1964 
 - Various pagings ;  30 cm. 
<br/><br/> Cover title 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mortality<br/>Life Expectancy
<br/><br/><label>Dewey Class. No.: </label>304.64