Mining 1924-1968 (points)

This file shows the maps of mining in Drenthe that were carried out between 1 925 and 1968 on behalf of the Deginning Company NV Lantschap Drenthe (period 1924-1950) and the mining company NV De Drie Provincien (period 1951-1968).本文件展示了1925年至1968年间，受Deginning Company NV Lantschap Drenthe（1924-1950年时段）以及矿业公司NV De Drie Provincien（1951-1968年时段）委托开展的德伦特（Drenthe）地区采矿作业相关地图。