The Shipping Company Gustaf Erikson archives contain 11 series. The classification follows the Finnish ABC classification scheme.
D. Copies
Da: Copies of outgoing letters
Includes 18 volumes of copybooks from 1893 to 1939.
Dd: Copies of letters to commanders
Includes five volumes of letters to commanders sent between 1928 and 1948. The letters are arranged alphabetically by the captain's last name.
E. Incoming documents
Ea: Letters from commanders
Includes 19 volumes of letters from commanders sent between 1909 and 1948. The letters are arranged in alphabetical order by the vessel's name.
Eb: Business letters
Includes 13 volumes of business letters from 1906 to 1953.
Ec: Circular letters to the vessels
Includes three volumes from 1945-1953.
Ed: Clarkson letters
Includes 24 volumes of letters from Gustaf Erikson's agent, H. Clarkson & Co. Ltd., spanning the years 1913 to 1948.
G. Accounting records
Ga: Accounting books of ships' crew
Includes 32 volumes of accounting books, ship's journals and more from 1902 to 1941. The series is arranged alphabetically by the vessel's name.
Gb: Clarkson's accounting reports
Includes six volumes of accounting reports from Erikson's agent, H. Clarkson & Co. Ltd., from the years 1917-1936.
H. Documents arranged by content
Ha: Ship documents
Includes 32 volumes of documents concerning vessels from 1910 to 1952. The series is arranged alphabetically by the vessel's name.
Hb: Charterparties
Includes six volumes of charterparties from 1910 to 1947. The series is arranged alphabetically by the vessel's name.
Hc: Documents
Includes eight volumes of diverse documents, including newspaper articles, seafaring magazines, photographs and maps.
You can find the complete archive description in Swedish (pdf, 14 pages) under the attachments.