Includes notes from various sources, some correspondence, copies of official and nonofficial documents, press cuttings, and reprints. Many of the files were opened in connection with Matson's articles for The Kenya Weekly News and continued.

Large file with material on vessels of all types on the East African coast, Lake Victoria Nyanza, etc.

List of ports, dates, etc., of voyages to East Africa.

Includes material on land, currency, agriculture, and crops, mining, rubber, traders, and trading firms.

List of trading firms in Zanzibar (1890s).

Includes material on Lango, Toro, Buganda, with reprints from the H.B. Thomas Collection (1901-1933).