Pärssinen, Martti <br/><br/>
Geometrically patterned ancient earthworks in the Rio Branco region of Acre, Brazil :  new evidence of ancient chiefdom formations in Amazonian interfluvial terra firme environment 

 - Renvall Institute publications, 14 .
<br/><br/><label>ISBN: </label>9521012579 
<br/><br/><label>ISSN: </label>07866445