A documentation research project to study the complex issues facing the historical documentation of multi-institutional collaborations in physics and allied sciences. Phase III focused on four disciplinary areas of ground-based astronomy, materials science, heavy-ion physics, and medical physics, and a category named computer-mediated collaborations. A materials science project, the Positron Consortium initially included Brandeis University, the City University of New York, Bell Laboratories, Brookhaven National Laboratory, and Norwich University (England). It later became a Participating Research Team (PRT) with less City College involvement and the addition of Bielefeld University (Germany). Its purpose was to build and use a positron beamline and end stations using Brookhaven's high-flux beam reactor to create an intense source of positrons. The consortium operated under a single grant from the National Science Foundation with indirect support from DOE and Bell Laboratories through the time that its people dedicated to the program. All data was taken at Brookhaven. The consortium began work in 1984 and a shutdown of the high-flux beam reactor in 1996 suspended the group's work.