Heck, Arch Oliver,  1887- <br/><br/>
Special schools and classes in cities of 10,000 population and more in the United States / 
by Arch O. Heck. 
 - Washington :  U.S. G.P.O. :  For sale by the Supt. of Docs.,  1930. 
 - v, 33 p. :  ill. ;  23 cm. 
 - Bulletin / United States Department of the Interior, Office of Education ;  1930, no. 7 .
 - Bulletin (United States.  Office of Education) ;  1930, no. 7. .
<br/><br/><label>LCCN: </label>e  30000162  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Children with disabilities--Education.<br/>Special education.
<br/><br/><label>LC Class. No.: </label>L111  / .A6 1930, no. 7