The archaeological focus on a single geographical area offers an opportunity to present projectile point typology as a microtechnology even though some of the types have widespread distributions. The area of the Middle Potomac River Valley presents a physical artefact collection for a view of prehistory. This volume, which includes several hundred images of the investigation, artefacts and archaeological research compiled and recorded from over 30 years of work in the area, includes: -an overview of the Middle Potomac River Valley archaeology including the peoples and sites; -new data and interpretations for the lithic technology of the area; and -classification and typology of artefacts including the