Individual and community health efficiency for living :  junior high school : health and safety education  health and safety education.- 

 - Minnesota (E.U.A) :  Department of Education,  1946. 
 - 333 p. 
 - Curriculum bulletin ;  10 .
<br/><br/><label>Encabezamiento--Tema: </label><br/>Higiene escolar<br/>Niņo, Estudio del