Antique map titled 'geotectonic diagram of the eastern part of the east indian archipelago': **title**: geotectonic diagram of the eastern part of the east indian archipelago **author**: h.a. Brouwer **source**: yearbook of the mining being in n.o.i. **publication year**: 1917 this large, antique folding map, which is composed of four sheets, is a detailed geotectonic sketch map of the eastern part of the east indies archipelago. Originating from h.a. Brouwer's 'year book of mining in n.o.i.' (yearbook of mining in the dutch east indies), published in 1917, the map offers a comprehensive geological overview of this region. As a geotectonic map, it details the geological structure and plate tectonics of the east indies archipelago, providing valuable insights into the region's geological history and composition. This includes information on rock formations, fault lines, and potentially volcanic and seismic activity, which are particularly relevant given the region's known geological dynamics. *this map is a significant historical and scientific document, representing early 20th-century geological understanding and cartographic techniques. It would be particularly valuable to historians of science, geologists, and collectors interested in cartography or the history of the east indies archipelago. The map's inclusion in the 'yearbook of mining in n.o.i.' underscores its importance as a resource for mining and geological studies in the dutch east indies (now indonesia), reflecting the colonial interests and scientific endeavors of the time.