Shelf

FIG. 1 is an isometric view of a shelf showing a first embodiment of the design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left side elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a top plan view thereof.

FIG. 7 is a bottom plan view thereof.

FIG. 8 is an isometric view of a shelf showing a second embodiment of the design.

FIG. 9 is a front elevation view thereof.

FIG. 10 is a rear elevation view thereof.

FIG. 11 is a left side elevation view thereof.

FIG. 12 is a right side elevation view thereof.

FIG. 13 is a top plan view thereof; and,

FIG. 14 is a bottom plan view thereof.

The shading lines shown in the drawings represent the three-dimensional contour of the claimed design and are not intended to indicate surface decoration. The dashed lines in the drawings represent or bound portions of the design that are not claimed.