Hellawell, C. R. <br/><br/>
Some practical background to considerations of the economic significance of spiral growth 

<br/><br/> Sobretiro de : IUFRO Congress. .16, Minich, 1967. 8 p. 
<br/><br/><label>LCCN: </label>13127 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Grano en madera.