Modifications to the WFS core questionnaires and related documents / 
prepared by WFS Central Staff. 
 - London :   International Statistical Institute,   1977. 
 - 24 p. :   forms. ;   24 cm. 
 - Basic documentation - World Fertility Survey ; no. 10 .
<br/><br/>  "Errata" slip, [1] leaf inserted. 
<br/><br/><label>Subjects--Corporate Names: </label><br/> World fertility survey
<br/><br/><label>Dewey Class. No.: </label>001.4222