FIG. 1 is a front view of a book page marker of a first embodiment showing my new design;

FIG. 2 is a rear view of the book page marker shown in FIG. 1;

FIG. 3 is a perspective view of the book page marker shown in FIG. 1;

FIG. 4 is a left side view of the book page marker shown in FIG. 1;

FIG. 5 is a right side view of the book page marker shown in FIG. 1;

FIG. 6 is a top view of the book page marker shown in FIG. 1;

FIG. 7 is a bottom view of the book page marker shown in FIG. 1;

FIG. 8 is a front view of a book page marker of a second embodiment showing my new design;

FIG. 9 is a rear view of the book page marker shown in FIG. 8;

FIG. 10 is a perspective view of the book page marker shown in FIG. 8;

FIG. 11 is a left side view of the book page marker shown in FIG. 8;

FIG. 12 is a right side view of the book page marker shown in FIG. 8;

FIG. 13 is a top view of the book page marker shown in FIG. 8; and,

FIG. 14 is a bottom view of the book page marker shown in FIG. 8.

The broken line showing of details in FIGS. 1-7 is included for the purpose of showing environmental portions of the book page marker and forms no part of the claimed design.