Title: The A to Z of inventions and inventors
Subjects: History, Encyclopedias, Inventions, Inventors, Biography, Juvenile Science (General), Juvenile Nonfiction, Children's Books/Ages 9-12 Fiction, Children: Grades 3-4, History - General, Science & Nature - General, Technology - How Things Work/Are Made, Technology - Inventions, 20th century, Inventions, history
Time periods: 20th century