An account of a geographical and astronomical expedition to the northern parts of Russia : for ascertaining the degrees of latitude and longitude of the mouth of the river Kovima : of the whole coast of the Tshutski, to East Cape : and of the islands in the eastern ocean, stretching to the American coast : performed, by command of Her Imperial Majesty Catherine the Second, Empress of all the Russias, by Commodore Joseph Billings, in the years 1785, &c. to 1794.