Fonds reflects the architectural practice of William Coverdale and his son William Miles Coverdale and is comprised of correspondence, financial records, design submissions and specifications, estimates, and reports relating various projects including the Criminal Lunatic Asylum, better known as Rockwood Asylum at Kingston, Ontario. Also includes photographs of the summer home of William Hugh Coverdale at Lemoine's Point Farm.
The fonds consists of correspondence from various members of the family, land grants, deeds, mortgages, stocks, wills, probates, power of attorney, financial records and a copy of the Herchmer Family Tree. Most of the material relates to Johan Jost Herkimer; his son Lawrence Herchmer; Lawrence's son, the Reverend Willam Macaulay Herchmer and his wife Frances and his son Col. William Macaulay Herchmer of the North-West Mounted Police.
Fonds consists of material collected in preparation for the defence of three accused war criminals as part of the Commission of Inquiry on War Criminals in Canada (Deschênes Commission), including the entirety of the defence documents relating to Vladimir Katriuk, Wasily Bogutin, and Serge Kisluk.
The fonds consists of detailed plans and drawings, professional estimates, proposals and reports, and specifications. Also included are subject files related to his professional interests contain correspondence, notes, reports and essays. There is a small amount of photographic and personal material.