Systematics of the electronic spectra of conjugated molecules : a source book. Papers of the Chicago group, 1949-1964 / John R. Platt and co-workers: M.A. el-Bayoumi ...[ et al. ] and Laboratory of Molecular Structure and Spectra. Platt, John Rader, 1918- University of Chicago. Laboratory of Molecular Structure and Spectra. Hydrocarbons Spectra. QC463.H9 S9 541.25 PLS Includes bibliographical references. Chicago : Laboratory of Molecular Structure and Spectra, Dept. of Physics, University of Chicago, 1964. 1964. 1964 Text v. : eng