Ag Agricultural census / assessment
Asmt Assessment
B&S Bargain and Sale (the purchase or sale of property)
Birth
Cens Census
Ch Christening
Death This may refer to a tombstone or to a record
Imm Immigration (arrival in Canada)
Marr Marriage
Patent The first deed to property when it is removed (alienated) from the Crown
Petition An application to the government requesting something
Sheriff's Cert Sheriff's Certificate, document authorizing the sale of seized land, usually for unpaid taxes