RESEARCH BULLETIN NO. 13 
THE UNIVERSITY OF NEBRASKA 
BULLETIN 
OF THE 
AGRICULTURAL EXPERIMENT STATION 
OF 
NEBRASKA 
STUDIES CONCERNING THE ELIMINATION OF 
EXPERIMENTAL ERROR IN COMPARA- 
TIVE CROP TESTS 
By T. A. KlESSELBACH 
Accepted for Publication December, 1917 
Distributed June 15, 1918 
LINCOLN, NEBRASKA, U. S. A. 
