Erwin L. LeClerg 
Field plot technique 
 - 2nd Edition. 
 - Minnesota  Burgess Publishing Co  1962 
 - 373p 
Erwin L. LeClerg; Warren H. Leonard & Andrew G. Clark: Field plot technique.  (2nd Edition.)  Minnesota.  Burgess Publishing Co, 1962.--(519.28LEC)   
ENGLISH 
519.28  / LEC