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2 matching references were found.
Scholl, W.; Davis, R.O., Saturated solutions of urea in liquid ammonia vapor pressures and compositions from -26.4 to 101.0c, Ind. Eng. Chem., 1934, 26, 1299-301. [all data]
Davis, R.O.; Black, C.A., Liquid area of urea + ammonia + carbon dioxide system, Ind. Eng. Chem., 1931, 23, 1280. [all data]