From Amazon:

Discover how prehistoric people utilized their natural environment and developed specialized techniques to harvest large numbers of bison long before the acquisition of horses. learn how these early cultures can be recognized by the projectile points they used and how to identify the different lithic materials used to manufacture their stone tools. Explore this unique aspect of Northern Plains archaeology with this in-depth study derived from many decades investigating some two hundred sites. PISHKUN is a valuable resource for both the professional and avocational archaeologist as well as anyone interested in the region’s rich prehistoric past. The outstanding color photography brings the subjects to life and provides a remarkable understanding of the sites and artifacts involved. This is a “must have” book for anyone interested in Northern Plains archaeology.