| Found in | Library of Congress Manuscript Division for the George F. Becker papers, 1814-1928 (Andreas Arzruni; b. 1847; d. 1898; mineralogist; instructor, Univ. of St. Petersburg; Univ. of Heidelberg, late 1860s; asst., Mineralogical Museum in Strasburg, 1875; lecturer and curator of the Mineralogical Museum affiliates at Humboldt Univ. in Berlin, 1877-83; prof., University of Wroclaw, 1883; prof. and head of the petrographic collection and scientific museum at at the Technische Hochschule in Aachen, 1884; until 1896, he undertook expeditions in the area of volcanism in Italy, Armenia, the Urals, as well as gold deposits in South America)
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