Take a look (CLICK) here for an interesting story of resource maps carried by Japanese soldiers into China. Are there modern parallels today? From the article:
Besides marking the distribution, the map classifies resources into different categories. For example, iron ore is categorized into phospho-iron ores, pyrites and ferromanganese ores -- or Zunhua Ore, Datong Ore and Qingdao Ore depending on the production area.
Transportation networks linking production areas to counties and villages are also detailed."