G.S. Callendar is noted for establishing the carbon dioxide theory of climate change. This presentation introduces a digital archive (DVD) of his manuscript letters, papers, journals, documents, and family photographs, including his extensive compilation of weather and climate data. Organized into eight volumes, this research-quality collection is a perfect companion to Callendar's biography. It is an essential tool for historians, climate scientists, and other scholars interested in climatic change and a desirable acquisition for libraries. Both the DVD and Callendar's biography have just been published by the American Meteorological Society.