A voyage to the Pacific ocean : undertaken by the command of His Majesty for making discoveries in the Northern Hemisphere to determine the position and extent of the West side of North America, its distance from Asia, and the practicability of a Northern passage to Europe performed under the direction of Captains Cook, Clerke, and Gore, in His Majesty's ships the Resolution and Discovery ; in the years 1776, 1777, 1778, 1779 and 1780. In three volumes