Child labor and the work of mothers in the beet fields of Colorado and Michigan ... 

 - Washington,  Govt. print. off.,  1923. 
 - v, 122 p.  plates. 
 - Bureau publication  no. 115 .
 - United States.  Children's Bureau.  Publication ;  no. 115. .
<br/><br/> At head of title: U. S. Department of labor.  James J. Davis, secretary.  Children's bureau.  Grace Abbott, chief.  "The investigation was planned and carried on under the direction of Ellen Nathalie Matthews ... Dr. Gertrude A. [sic] Light made physical examinations of children in the Colorado beet-field region and analyzed the findings with reference to health." - Letter of transmittal, p. v. 
<br/><br/><label>LCCN: </label>l  23000069  
<br/><br/><label>LC Class. No.: </label>HD6250.U4  / C62 1923 
<br/><br/><label>National Library of Medicine Call No.: </label>W1  / UN6181 no.115 1923