Subseries consists of documents related to Reid, Collins and Associates work in Pakistan, China, Indonesia, and Brazil.

Subseries consists of research and reports done by Hubert on the topic of the effect of air pollution on forest health. Most of the research is around the Alcan aluminum smelter in Alberta. In 1972, the aluminum manufacturing company Alcan (now known as Rio Tinto Alcan) approached Reid Collins to do a study on the effect of emissions from their Kitimat aluminum smelter plant on the surrounding environment and forests. This became a long term project on which Bunce was heavily involved. A number of published articles and maps were produced over the years, some of which can be found in this subseries.