Excerpt: If you meander through the center of Concord, Massachusetts, perhaps touring the habitations of celebrated local resident Ralph Waldo Emerson or retracing the perambulations of “Walking” enthusiast Henry David Thoreau, you will encounter a sign commemorating the location of an “Indian fishing weir” (figure 1). The weir itself is no longer extant, you are given to understand, having been replaced by a dam constructed in the seventeenth century that later became the namesake of a town street. The sign stands just above a brook that winds through the small downtown, close to the confluence of the Assabet and Sudbury Rivers at “Egg Rock,” where they become the Concord River. The sign’s mission is to relay certain histories…