Woods of the middle Eocene Nut Beds Flora, Clarno Formation, Oregon, USA. 
 Woods of the Eocene Nut Beds Flora, Clarno Formation, Oregon, USA 

 - 188 p.  ill., map. 
<br/><br/> Supplément de : "IAWA journal", Supplement 3 
<br/><br/><label>ISBN: </label>90-71236-52-8