Sign holder for book shelving

FIG. 1 is a perspective view from the front, top, and right side of a sign holder according to this invention, the broken lines showing environment and not being part of the design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines are shown for illustrative purposes only and for no part of the claimed design.