Thermodynamic Kauzmann temperatures, T-K, published dielectric relaxation and viscosity Fulcher temperatures, T-0, and nonlinear enthalpic Adam-Gibbs temperatures, T-2(AG), are compared for three isomeric indanes that differ only by the position of an aromatic methoxy group, and for o-terphenyl (OTP) and tri-alpha-naphthyl benzene (TNB). All three temperatures agreed to within estimated experimental uncertainty for all glasses, with one probable exception. Adam-Gibbs "primary" activation energies Delta mu of 1400, 1120, and 2750 kJ mol(-1) were derived from the enthalpy relaxation parameters for the o-, m- and p-indanes, respectively, compared with the dielectric values of 900, 990, and 1040 kJ mol(-1). The enthalpy relaxation values of Delta mu for OTP and TNB were 940 and 545 kJ mol(-1), respectively.