The dynamic earth : an introduction to physical geology

The heat within

Ice Age earth : late Quaternary geology and climate

Essential science

Natural regions of the United States and Canada

What is life? : the physical aspect of the living cell ; with, Mind and matter ; & Autobiographical sketches

Great thinkers of the Western world : the major ideas and classic works of more than 100 outstanding Western philosophers, physical and social scientists, psychologists, religious writers, and theologians

Tell me why

Dictionary of philosophy and psychology, including many of the principal conceptions of ethics, logic, aesthetics, philosophy of religion, mental pathology, anthropology, biology, neurology, physiology, economics, political and social philosophy, philology, physical science, and education, and giving a terminology in English, French, German, and Italian,