FIG. 1 is a perspective view of a first embodiment of a bookcase showing the design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a perspective view of a second embodiment of a bookcase showing the design;
FIG. 9 is a front view thereof;
FIG. 10 is a back view thereof;
FIG. 11 is a right side view thereof;
FIG. 12 is a left side view thereof;
FIG. 13 is a top view thereof;
FIG. 14 is a bottom view thereof;
FIG. 15 is a perspective view of a third embodiment of a bookcase showing the design;
FIG. 16 is a front view thereof;
FIG. 17 is a back view thereof;
FIG. 18 is a right side view thereof;
FIG. 19 is a left side view thereof;
FIG. 20 is a top view thereof; and,
FIG. 21 is a bottom view thereof.
The broken lines showing the rectangle dividers that can be seen in the interior of the bookcase, and the broken lines showing the bottom features of the bookcase, and the back of the bookcase in the third embodiment are included for the purpose of illustrating environment and form no part of the claimed design.