Group of 11 extracts / reports but German geologist Erich Haarmann. The group dated from the 1920's - 1930's. Contents are bright and illustrated. 

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Erich Haarmann

Erich Haarmann (born 14 June 1882 in Osnabrück , Germany) was a German geologist.

Haarmann came from a family of steelindustries. His father was August Haarmann (1840-1913), director of the Stahlwerk Georgsmarienhütte . [1] He was first to join the mining industry and become a mining engineer. Haarmann studied geology in Berlin and Munich, in addition to mining. In 1905 he became a Bergreferendar and in 1908 he was promoted to Hans Stille ( The geological conditions of the Piesberg near Osnabrück and its surroundings ). He was a member of the Prussian Geological Land Institute (PGLA) from 1909 to 1911 [2] and was a member of a drilling company in Mexico for two years. Afterwards, he was free-lance and became a lecturer in 1915 in Berlin. From 1918 he had a Lehrabetrag for economic geology at the Humboldt-Universität Berlin and became 1922 an extraordinary professor. He stayed there for the rest of his career. He developed an extensive expert opinion and was financially independent from the outset. He had been a member of the German Geological Society since 1904. [3] In 1932 he was elected a member of the Leopoldina . [4]

Haarmann also dealt with geology history, collected geologists' letters, and planned a geological archive . In March 1943, however, his own collection of more than 25,000 documents fell victim to a bomb attack on Haarmann's apartment in Berlin. [5] The Geologenarchiv (the geological association) in Freiburg was built starting from 1956 by Max Pfannenstiel.

In 1916 he published his theory of oscillation for the explanation of tectonic processes such as mountain formation, one of the many explanatory models developed in tectonics prior to the establishment of plate tectonics. Thereafter, there are large up and down movements in the crystalline earth crust, swelling (geotumor) and sinking (geo-depression). In the case of the swelling, the sedimentary surface and fracture are ruptured, as a result of the swelling of the rock formation (in a secondary hardening) either on one side or on both sides in a trough on both sides. As a cause, he imagined cosmically triggered mag- net displacement below the crust and saw similar events on the moon. [6] This theory is related to the undation theory of Hans Stille from the 1930s. Silence and his disciple Haarmann were later scientific opponents.