Microwave spectroscopy C. H. Townes [and] A. L. Schawlow. Townes, Charles H. Schawlow, Arthur L., 1921-1999, joint author. Microwave spectroscopy. Gases. QC454 .T7 539.1 TOM New York : McGraw-Hill, 1955. 1955. 1955 Text 698 p. : eng International series in pure and applied physics