I found this better reading than Earth Conquerors (see page 286) and a book with a wider market and a more permanent appeal. Following the trails of the early explorers, Spanish, French, English, by sea and land, the book adds bit by bit to the history of the American map, between 1513 and Ponce de Leon in his search for the Fountain of Youth, to the exploration of the Grand Canyon in 1869. The emphasis is on the men, their adventures, their contribution. But the story it unfolds is a romantic and exciting one, and fills in with colorful detail the hackneyed background of schoolday information. Ideal supplementary reading for American history and geography, so should have a plus sale in juvenile departments.