Wimmer, E J <br/><br/>
HOW TO MAKE HORIZONTAL DEMONSTRATIONS VISIBLE TO AN ENTIRE CLASS.  [electronic resource] 

 -  Science (New York, N.Y.)  Nov 1930 
 - 533-4 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0036-8075 
<br/><br/><label>Standard No.: </label>10.1126/science.72.1873.533  doi