The fonds consists of records documenting the administration and research projects of TRIUMF (Tri-University Meson Facility), particularly the TRIUMF operations and experiments at the University of Victoria. Fonds includes correspondence of TRIUMF chairman John Climenhaga and of R.M. Pearce, agenda, minutes of meetings, financial records, records of TRIUMF users' groups (Slow Neutron, Meson, Proton and Radiochemistry), proposals and contracts for TRIUMF projects, and publications by Professor Pearce on various aspects of nuclear physics.