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Gudro, I. and Zigmunde, A. 2020. Friedrich August Nauck (1855–1913) – Graduate of Riga Polytechnicum, Initiator of Control-Ticket Printing in Riga. History of Engineering Sciences and Institutions of Higher Education. 4, (Oct. 2020), 75–100. DOI:https://doi.org/10.7250/HESIHE.2020.005.