The circumference of the earth is almost 25,000 miles. but in the first few decades of the 20th century this great distance was reduced from a journey of many months to one of a few days. Thus the …
every year men add fresh facts to the long record of human achievement. Our crowded libraries have turned to microfilm to preserve the great mass of printed material, and the sheer bulk of governme…
Since the dim and shadowy ages when man first made his appearance on the earth, he has evolved into a creature possessing abilities never attained by any other living organism. The pages of history…
In all history, no area of human endeavor has grown so rapidly or changed so drastically as the physical sciences have since 1900. Such terms as the Age of Machines, applied to the 19th century, se…
This volume tells the story of America, not just the story of the United States, but the story of all the Americas from Canada to Cape Horn. To tell it, we have tried to capture the "highlights," t…
Man has long been interested in the wonderful world of life. For one thing, man himself is a living thing and as such is part of the whole complex of life on the earth. His life is intricately inte…
Agriculture and industry are the practical framework of modern society. Since the dawn of history man has always been dependent on agriculture to provide him with the food he needs to subsist. For …