Willan, R.L. <br/><br/>
Natural variation as a basis for tree improvement / 
compiled by R .L. Willan, Kirsten Olesen and H. Barner. 
 - Copenhagen :   Danida Forest Seed Centre,   1989. 
 - 13 p. ;   30 cm. 
 - Lecture note ;   no. A-3 .
<br/><br/><label>Subjects--Topical Terms: </label><br/> Forests and forestry.<br/> Tree breeding.