TY - BOOK ED - United Nations Institute for Traning and Research (UNITAR) TI - International conference on heavy crude and tar sands: 2. Summary report U1 - 665.5 PY - 1982/// CY - Caracas PB - UNITAR KW - PetrĂ³leo KW - Medio Ambiente KW - Congresos y Conferencias N1 - 06439; Resources. International cooperation. Production. Enviroment. Technological developments. Upgrading and refining. Marketing. The future of heavy crude oil and tar sands, an overview ER -