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GTK archives contain thin sections, polished thin sections and polished sections made from bedrock samples. These samples have been collected by GTK's bedrock mapping and exploration projects, and by Lapin Malmi and Outokumpu exploration projects. Finnish universities have occasionally relinquished thin sections prepared for their own research projects to GTK. The total number of archived thin sections is over 150 000.
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In regard to product series, such as Detailed aerogeophysical survey, or Aerogeophysical low altitude maps at 1:20 000 scale, the intended areas or map sheets must first be selected with the "Area selection" tool in the map window and then be transferred with the "Download" or "Buy" button to the Shopping Cart or with "Order" buttom to the Order request form.