Pump-probe photoelectron spectroscopy is used to study excited states in pristine and photopolymerized C-60. For the first time in a molecular solid, vibrationally broadened singlet (SI) and triplet (TI) exciton photoemission spectra are temporally isolated and unambiguously assigned. Complex transient behaviors of S, and T, populations, including non-Markovian decays and a strongly enhanced production of T, states at high excitation, provide evidence for interactions among excitons and free carriers. A new rate-equation model reproduces a wide range of both laser- and synchrotron-based data from polymerized films.