The US Army hired more than 125,000 people to help develop the atomic bombs. They worked and lived in remote areas, and they couldn't tell anyone about their work. This secretive program was known as the Manhattan Project. The Manhattan Project explores the workers' experiences and the development of the atomic bombs. Easy-to-read text, vivid images, and helpful back matter give readers a clear look at this subject. Features include a table of contents, infographics, a glossary, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards. Core Library is an imprint of Abdo Publishing, a division of ABDO.