Stacking shelf of bookshelf

FIG. 1 is a top perspective view of a stacking shelf of bookshelf;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is an opposite side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the drawings depict portions of the stacking shelf of bookshelf that form no part of the claimed design.