International conference on heavy crude and tar sands: 2 

 - Caracas:  UNITAR,  PDVSA,  1982 
 - 1000 p.  cuadros. 
<br/><br/>06436 
<br/><br/>Definitions and clasifications. Cooperation in the development of heavy crude and tar sands. Goverment policy. Medium and long - term planning and marketing including international trade. Occurrences. Biochemistry. Exploration and resources evaluation. Chemistry and geochemistry. Geology. Enviromental aspects. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petróleo<br/>Gas Natural<br/>Planificación<br/>Medio Ambiente<br/>Congresos y Conferencias
<br/><br/><label>Dewey Class. No.: </label>665.5  / U5813 / n.2 - 3