Mezue ahịrịokwu na-esonụ: Ihe atụ abụọ dị ịrịba ama nke mbụ gụnyere map nke Napoleon March na Moscow nke Charles Joseph Minard mepụtara na 1869; "coxcombs" nke Florence Nightingale ji mee ihe na 1857 dị ka akụkụ nke mkpọsa iji melite ọnọdụ ịdị ọcha na ndị agha Britain; na map ntụpọ nke John Snow ji mee ihe na 1855 iji gosipụta njem ahụ.
Ọrịa ọgbụgbọ na Broad Street.