Low-temperature Phase Equilibria of Helium-bearing Natural Gases: Exell Gas, Issues 6001-6020

A Method of Obtaining the Ultraviolet and Visible Spectra of Insoluble Materials: Use of a Low-molecular-weight Polyethylene as a Matrix Material, Issues 6421-6440

Reservoir Oil Characteristics, Greater Aneth Area, Utah: Unusual Saturation-pressure Variations, Issues 6181-6200