Bookshelf

FIG. 1 is a perspective view of a bookshelf showing the claimed design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an enlarged view of area 9 shown in FIG. 1 ;

FIG. 10 is an enlarged view of area 10 shown in FIG. 2 ; and,

FIG. 11 is an enlarged view of area 11 shown in FIG. 1 .

The broken lines depict portions of the bookshelf that form no part of the claimed design.