I claim the ornamental design for a magazine holder, as shown and described.
FIG. 1 is a right side view of a magazine holder in a closed position showing my new design;
FIG. 2 is a right side view of the magazine holder in an open position;
FIG. 3 is a rear view of the magazine holder of FIG. 2;
FIG. 4 is a top view of the magazine holder in a closed position;
FIG. 5 is a top view of the magazine holder in an open position; and,
FIG. 6 is a top view of a magazine holder in an open position, showing a magazine inserted therein for illustrative purposes.
Throughout the drawings, the short thin dashed lines represent either footwear and a magazine as an illustrative environment of the Magazine Holder of my new design, and the thick dashed lines on a flap of the Magazine Holder illustrate stitching that is not claimed.