"A History of the Boundaries of Arlington County, Virginia" by Arlington Co. is a historical account published in the late 20th century, specifically in 1967. This book serves as a detailed documentary reference on the geographical and political boundaries of Arlington County, tracing the changes in its jurisdiction from the early colonial period through various legislative acts until recent times. It explores the relationships between Arlington County, the City of Alexandria, and the District of Columbia. The book delves into the complex history of boundary changes affecting Arlington County, beginning with its first acknowledgment in 1608. It details the shifting jurisdictions of various counties over the centuries, such as Northumberland, Westmoreland, Stafford, Prince William, and finally, Fairfax County, until it became recognized as a distinct entity. Key legislative milestones are highlighted, including the cession of a part of Virginia to create the District of Columbia and the eventual retrocession of Alexandria County back to Virginia in 1846. The narrative emphasizes the significance of these territorial adjustments and provides insights into the legal and civic implications of boundary changes over the decades, including the impact of urban development on boundary conflicts and negotiations up to 1966. (This is an automatically generated summary.)