Walker, Robert,  lecturer in mathematics. <br/><br/>
The essentials of arithmetic :  a manual for teachers / 
Robert Walker 
 - Lond. &c.,  1929. 
 - 342 p. :  22cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic
<br/><br/><label>Dewey Class. No.: </label>511  / WAL 1929