The infra-red spectra of complex molecules. Bellamy, L. J. Molecular spectroscopy. Infrared spectra. Chemistry, Organic. QD476 .B3642 1958 547 19 BET Continued by Advances in infrared group frequencies. London, Methuen; New York, Wiley [1958] [1958] 1958 Text xix, 433 p. : eng