TY - RPRT TI - Lecture experiments in general chemistry. VI. The liquefaction and fractionation of air. VII. The liquefaction and fractionation of natural gas AU - S. Morris AU - A.J.W. Headlee PY - 1941 DO - 10.1021/ed018p79 UR - https://pubs.usgs.gov/publication/70011064 ID - 70011064 ER -