Exploring the great wilderness of Alaska's Brooks Range was Robert Marshall's joy and delight during the decade between 1929 and 1939. Marshall traveled this spectacular country, from the Upper Koyukuk drainage to the Arctic Divide, making maps, recording scientific data, and exalting in the beauty of that incredibly pristine landscape. Although his early death at thirty-eight ended an exceptional life too early, he left journals and letters to describe his favorite place on earth.