Colby, Mary Ruth,  1893- <br/><br/>
The county as an administrative unit for social work, 
by Mary Ruth Colby ... 
 - Washington,  U.S. Govt. print. off.,  1933. 
 - v, 48 p. 
<br/><br/> At head of title: United States Dept. of labor, Frances Perkins, secretary.  Children's bureau, Grace Abbott, chief. 
<br/><br/><label>LCCN: </label>l  33000125  
<br/><br/><label>LC Class. No.: </label>HV95  / .C6 
<br/><br/><label>National Library of Medicine Call No.: </label>W1  / UN6181 no.224 1933