This collection contains materials related to the mosquito control activities of Donald M. Rees. The majority of the collection deals with his activites in Utah, primarily with the success of mosquito abatement activities and the influences of climatic changes on these efforts. The collection also contains materials concerning his involvement with mosquito control activities at the Panama Canal and in Indonesia. A small portion of the collection relates to his activites at the University of Utah in the Department of Zoology and Entomology and the Institute of Environmental Biological Research.