Dipolar-decoupled, natural abundance, cross-polarization13C NMR spectra of polycarbonate have been obtained at 22.6 MHz, both with and without 3-kHz mechanical spinning at the magic angle. The 100-Hz resolution achieved by spinning produces spectra as detailed as those of the same polymer in solution. The13C rotating frame relaxation times (at 30 kHz) for individual lines of polycarbonate are dominated by spin-lattice processes and so contain information about slow motions. Analysis of these slow motions emphasizes the dynamic heterogeneity of the glassy state.