This collection consists of miscellaneous ledgers and legal documents of businesses, doctors, etc. in Peterborough, surrounding counties and areas in southern Ontario.

This collection consists of technical plans and details of the Deloro mining processes, labour relations and union papers, medical information concerning arsenic poisoning, historical material regarding Deloro and the village of Marmora, maps, and plant photographs, layouts, and site plans.

Collection consists of employee records, plant and engineering operations, and photographs of Deloro village and the Deloro mining and smelting site.

Fonds consists of maps and plans of the Ottawa and Haliburton areas, time-books of Bronsons and Weston logging firm, and photographs of the building of a railway, and of the Haliburton area. Included also are research material and manuscripts relating to books which Harley R. Cummings wrote about schools in the Ottawa area, and on the history of Haliburton. Included are notes on John Strachan and a transcript of his diary. The fonds also includes several genealogical charts of the MacCallum family.