PRODUCTION OF COAL, IRON, AND WHEAT IN THE LEADING COUNTRIES OF EUROPE.
The political divisions are shown as they were before the Treaty of Bucharest in 1913.

Coal in the upper map and iron in the lower map are shown by solid black areas; wheat is shown on the lower map by the shaded areas.

The solid black on each map generally shows the total area at the date of the preceding map, the shaded area the territory since added. On the first map the solid black is the area in 1450. On the map for 1806 the dotted line separates the Polish territories lost in 1815 from those retained. The limits of the present German Empire are shown on each map.