Explores the physical structure of the Earth's landforms, including what they are, how they look, how they were created and change over time, and major geological events associated with each.
Entries on 200 extinct, endangered, vulnerable, and threatened animals and plants describe the individual species, its habitat and current distribution, and efforts to protect and preserve it.
Entries on more than 200 extinct, endangered, vulnerable, and threatened animals and plants describe the individual species, its habitat and current distribution, and efforts to protect and preserve it.
A ten-volume overview of the twentieth century which explores what characterizes each decade as expressed through the arts, economy, education, government, politics, fashions, health, science, technology, and sports.
A ten-volume overview of the twentieth century which explores what characterizes each decade as expressed through the arts, economy, education, government, politics, fashions, health, science, technology, and sports.