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Office for Soil Research in Berlin.
The postcard was stamped on January 7, 1941 in Berlin.
Labeled on the reverse and with an ink signature by Professor Dr. HEINRICH QUIRING.
He was a German geologist who dealt in particular with mineral deposits.
From 1935 he headed the Saarland geological research center. During the Second World War he worked as a military geologist, among other things, on preparations for a planned tunneling under the Rhine.
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