This is no popularization of material -- no flavorful title in Rivers of America, but a serious, somewhat ponderous tone, --factual, historical, economic, geographical, political. Solid material for reference or for serious digesting. He covers every aspect of the river and the lands it waters; -- pre-historic evidence, climates, jungles, plant and animal life, the peoples (both Indian and European), the explorers, travelers, promoters. He appraises the treasures of the Amazon, now and in the future. Then he goes on to a careful study of the six nations, history, politics, mutual collaboration, and relations -- past, present and future -- with the U.S.A. Certainly not a book for the casual reader.