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Excess molar enthalpies H m E and volumes V m E were measured as a function of mole fraction at 298.15 K and atmospheric pressure for each of the 12 binary mixtures: diethylamine or dipropylamine + di-1-methylethyl ether, 1,1-dimethylethyl methyl ether, 1,1-dimethylpropyl methyl ether, tetrahydrofuran, tetrahydropyran, and 1,4-dioxane. The results were compared to H m E and V m E for related mixtures and the specific interactions noted. The NRTL, UNIQUAC, and UNIQUAC ASM models of liquid mixtures were fitted to the results. The experimental results have been correlated and compared with the results from the extended real associated solution (ERAS) theory.