This fonds consists of research materials collected by Professor Ross Irwin for his book on Mariposa Township, Victoria County. Material added August 1992 includes a copy of Mariposa: The Banner Township and a series of 8 scrapbooks created by Mrs. Alex McIntyre of Oakwood, Ontario and donated via Professor Irwin. Additions of 1994 include slides of Lindsay, Ontario and other scenes in Victoria County taken in approximately the 1960s. Additions of 2002 include 2 notebooks of Robert Irwin, Cambray. Additions of 2010 include studio portraits of ancestral family members. Additions of 2012 include items related to the history of the Wakelin family and a scribbler with house-building notes.

This fonds consists of microfilmed copies of 3 volumes, which include 2 registers of baptisms (1852-1893), and one register of burials (1851-1906).

The microfilms were produced by the Archives of Ontario from records in possession of the Clerk of the United Counties of Northumberland and Durham dating from 1849 to 1870. This collection includes the rolls of the towns, villages and townships of the United Counties arranged in alphabetical order as follows: Alnwick, Bowmanville town, Brighton, Brighton village, Cartwright, Cavan, Clarke, Cobourg town, Colbourne Village, Cramahe, Darlington, Haldimand, Hamilton, Hope, Manvers, Monaghan South, Murray, Newcastle village, Percy, Port Hope town, and Seymour.

This addition to the fonds consists of original assessment and collectors' rolls from municipalities within the United Counties of Northumberland and Durham.

This fonds consists of township records, by-laws, legal correspondence, records of the Queen's Bench and General Quarter Sessions of the Peace for the United Counties of Northumberland and Durham. Records include indictments, convictions and inquests and case records (which are effectively a continuation of the inquests, convictions and indictments series).

The fonds is arranged into 9 series:

1. Township business with bylaws, oaths of coroner's and coroner's commissions and jail surgeons
2. Voter's lists and books including militia rolls
3. Juries and jurors
4. Convictions and return of convictions
5. Inquests
6. Indictments
7. Magistrates returns
8. Justice of the Peace Commissions
9. Criminal and Civil Procedures and Correspondence and Case Records which reflect a change in the organization of records by the County Clerk's office after 1914 and which contain inquest, conviction and indictment documents.
10. Correspondence and miscellaneous

This fonds consists of bound volumes of births, marriages and deaths for the United Counties of Northumberland and Durham and loose marriage documents. Fonds is organized into two series: loose documents and bound volumes.

This addition to the fonds consists of baptism records, marriage lists, and burial lists for the United Counties of Northumberland and Durham.

The assessment and census returns contained in this microfilm are taken from the Journals of the Assembly of Upper Canada and its successor, the Assembly of United Canada from 1824 to 1850.

The microfilms are copies of assessment and census rolls, 1803-1850, voter's lists, 1854, and poll books, 1816, 1820, 1824 for the Newcastle District. Area covered includes various townships in the present-day counties of Peterborough, Northumberland, Durham and Victoria. The townships of Hamilton and Haldimand were not filmed.

This fonds consists of assessment and collectors rolls for Victoria County, Canada West and Ontario.

This fonds consists of 575 bound volumes of Victoria County administrative and financial records and court records. It includes 228 local business journals, day books, ledgers, County council material, criminal justice accounts and court documents.

This item is a voter's list for the townships of Sherborne and McClintock in the Provisional County of Haliburton, listing people who were able to vote at both Municipal Elections and Elections to the Legislative Assembly or only at one of the two elections.

This collection consists of voters lists for various townships in Peterborough, Durham, Brant and Hastings counties such as Asphodel, North Monaghan, Otonabee, Harvey, Burleigh and Anstruther, Dummer, Hope, Brantford, Onondaga, the Town of Paris and Sidney.