International conference on heavy crude and tar sands : 2 Petróleos de Venezuela S.A., PDVSA; United Nations Institute for Traning and Research, UNITAR; |
International conference on heavy crude and tar sands : 2. Summary report |
International conference on heavy crude and tar sands : 2 Petróleos de Venezuela S.A., PDVSA; United Nations Institute for Traning and Research, UNITAR; |