Olson, Willard C.  1899- <br/><br/>
The measurement of nervous habits in normal children / 
by Willard C. Olson. 
 - Minneapolis :  The University of Minnesota Press,  1929 
 - xii, 97 p. :  diagrs. ;  20 cm. 
 - University of Minnesota. The Institute of Child Welfare. Monograph series no. III .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nervous system--Diseases<br/>Children--Diseases<br/>Habit