Carte de la production, de la circulation, de la consommation des minerais et de la production des metaux en Belgique - David Rumsey Historical Map Collection
▻https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~303650~90074096:Carte-de-la-production,-de-la-circu
Color map of Belgium 73x87, dissected into 24 sections of 18x14, backed with linen. Showing production, circulation, consumption of minerals and the production of metals in Belgium during 1878. Includes color coded signs showing production, consumption and transportation of minerals, and Table of mines, minerals, factories and production of iron, zinc, lead, copper or pyrite minerals in 1878. Map showing cities, villages, roads, railroads, rivers, canals, etc. Includes legend and text. This flow diagram was likely influenced by the work of #Charles_Joseph_Minard.