In the Phase Equilibrium section the experimental data for 19 binary systems are reported. The availability of these data will allow extension and prediction of correlations for predicting such equilibria. In the Pure Component Properties section, the procedures used for compiling and evaluating pure component property data in DIPPR Data Compilation Project 801 are detailed. Also, liquid vapor pressure measurement results for 18 compounds obtained in DIPPR Project 821 are presented, and four papers give the results of critical property measurements on 44 compounds from DIPPR 851. Finally, enthalpy of formation data for seven compounds measured in DIPPR Project 871 are presented. Annotation copyright Book News, Inc. Portland, Or.