FIG. 1 is a perspective view of a book cover showing my new design, the strap and ring structure depicted by means of broken lines being for illustrative purposes only and forming no part of the claimed design.

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front end view thereof;

FIG. 5 is a rear end view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is another perspective view thereof with the cover portion open revealing an interior book partition; and,

FIG. 9 is yet another perspective view thereof with the cover portion open and the book partition opened to show additional interior features of the design.