Logs, mainly of steamships but also of motor vessels. Details recorded are name of ship, name of ship's master, dates and times of outward and return sailings, details of cargo and passengers and general remarks about the voyage.

Partnership agreements; memorandum and articles of association; directors’ reports and accounts; correspondence and papers relating to Thor Thoresen Linje; correspondence and papers relating to merger with Powell Duffryn; financial records; steamer regulations; house flag; voyage books; freight books; employment records; photographs; lists of men and ships lost in 1914-1918 and 1939-1945 wars; papers relating to history of company and Robertson family.