Reports of investigations. 4871. Separation and utilization studies of bitumens from bituminous sandstone of Vernal and Sunnyside, Utah deposits: pt. 1, Laboratory hot-water separation tests, by G. D. Shea and R. V. Higgins; pt. 2, Analytical data on asphalt properties and cracked products of separated bitumens E W. J. Wenger, R. L. Hubbard, and M. L. Whisman.

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