The typescripts are arranged into four series. A: manuscripts related to Oregon; B: manuscripts related to Washington; C: manuscripts related to Canada and particularly British Columbia; C: manuscript related to the history of Oregon and the fur trade.

In series C, of particular interest are the first and second journal of Simon Fraser, 1806, 1808; the voyages of the ship Columbia, 1787-1789; and the journal of John Work, Chief Factor, Hudson’s Bay Company, Astoria, 1824-1834.