Sources of the River, 2nd EditionBy: Jack Nisbet The awe inspiring story of explorer David Thompson, whose expeditions helped shape western North America In this true story of adventure, author Jack Nisbet re creates the life and times of David Thompsonfur trader, explorer, surveyor, and mapmaker. From 1784 to 1812, Thompson explored western North America, and his field journals provide the earliest written accounts of the natural history and indigenous cultures of the what is now