In this book, the author presents the narratives of two expeditions authorized by the United States to discover the sources of the Mississippi River, offering a concise summary of the important facts and information gathered over a period of twelve years. The author explains the definition of a river's true source and asserts that the combined narratives prove that the Itasca Lake is the source of the Mississippi River. The book also sheds light on the domestic organization and social habits of the expedition parties, adding to the historical and cultural significance of the expeditions. This book provides a comprehensive and informative account of the expeditions and their contributions to scientific knowledge and exploration.