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- [22] TAR SANDS AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS, 1981, 65 (10): : 2290 - 2293
- [25] PRELIMINARY STUDIES ON THE RECOVERY OF BITUMEN FROM NIGERIAN TAR SANDS - BENEFICIATION AND SOLVENT-EXTRACTION ENERGY SOURCES, 1987, 9 (03): : 173 - 188