FIG. 1 is a top perspective view of a shelf with square support-receiving hole;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevational view thereof; and,
FIG. 6 is a left-side elevational view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings form no part of the claimed design. A rear elevational view is not shown because it is a mirror image to the front elevational view shown in FIG. 5. A right-side elevational view is not shown because it is a mirror image to the left-side elevational view shown in FIG. 6.