Curriculum for elementary schools :  June 1928 

 - Minnesota :  State Department of Education,  1928. 
 - 560 páginas 
<br/><br/> "Prepared under direction State Board of Education. Reprinted 1943" 
<br/><br/><label>Encabezamiento--Tema: </label><br/>Educación primaria--Estados Unidos--Planes y programas