The shaded region represents 2/3 of rectangle.
Ellsworth D. Foster ed. The American Educator (vol. 1) (Chicago, IL: Ralph Durham Company, 1921)
TIFF (full resolution)
3000×1843, 451.9 KiB
Large GIF
1024×629, 55.9 KiB
Medium GIF
640×393, 31.3 KiB
Small GIF
320×196, 12.5 KiB