Among documented working rifle makers are Adam Haymaker, who had a thriving trade in the northern Shenandoah Valley of Virginia, the Moravian gunshops at Christian's Spring in Pennsylvania, John Frederick Klette of Stevensburg, Virginia, and in the Salem area of North Carolina. All three areas were busy and productive centers of rifle making by the 1750s. The Great Wagon Road was a bustling frontier thoroughfare, and rifle shops traced this same route - from eastern Pennsylvania, down the Shenandoah Valley, and spilling into both the Cumberland Gap into Kentucky and the Yadkin River (Salem) area of North Carolina.