Hills, W.E. <br/><br/>
Heartwood and tree Exudates 
W.E. Hills. 
 - New York  Springer Verlag  1987 
 - vii,208p., ill.; 25cm. 
<br/><br/><label>ISBN: </label>3540175938. 
<br/><br/><label>Dewey Class. No.: </label>582.16010424,  / H65H