If I were looking for historical information (19th Century) about specific #Irish immigrants in Leeds County in Ontario, Canada does anyone know where I might start looking? Is information like this published online by the county or province or is this something that local libraries might be able to help with?

This is a #lazyweb question, but I'm inquiring for my aunt who has otherwise done a great deal of non-internet work on this over the past 20 yrs. Maybe more is digitized now?