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Figure 2. Photo from 1956 taken at the Yakutsk Branch of the USSR Academy of Sciences. Radio technicians S. N. Druzhinin and V. P. Razin undertake the calibration of muon counters in a shaft at a depth of 60 m. The extensive underground research complex at Yakutsk provided data for many important research papers and doctoral dissertations. (Photo provided by Sergei Druzhinin and Sergey Starodubtsev).
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