“A polygon of...seven sides [is] a heptagon.” —Hallock 1905
V. I. Hallock I.C.S. Refrence Library (Scranton: International Textbook Company, 1905) 6:25
TIFF (full resolution)
1999×2400, 187.7 KiB
Large GIF
852×1024, 22.7 KiB
Medium GIF
533×640, 12.9 KiB
Small GIF
266×320, 6.3 KiB