Collazo Grau , Nelsonrafael <br/><br/>
Pictografías petroglifos 
Nelsonrafael Collazo. 
 - Jayuya, P.R.  Nelsonrafael Collazo Grau  [2004]. 
 - xii, 126 p.  ill. (some col.)  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petroglyphs--Puerto Rico.<br/>Indians of Central America--Antiquities.<br/>Picture-writing, Indian.<br/>Picture-writing--Puerto Rico.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Antiquities.