Includes bibliographical references and 4 volume index in the back of each volume.
Contents:
Volume 1. Pre-colonial times through the American revolution -- volume 2. The federal era through the 19th century -- volume 3. The early 20th century through World War II -- volume 4. The post-war period into the 21st century.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.