Poulsen, Gunnar. <br/><br/>
Man and tree in tropical Africa :  three essays on the role of trees in the African environment / 
Gunnar Poulsen. 
 - Ottawa :  International Development Research Centre,  c1978. 
<br/><br/> "IDRC-101e." 
<br/><br/><label>ISBN: </label>0889361541 (pbk.) 
<br/><br/><label>LCCN: </label>cn 79070081 
<br/><br/><label>Nat. Bib. No.: </label>C79-70081-6