Russia 2971-2971C

$ 1.85

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Russia 2971-2971C, MNH, $2.20. Michel 3017, 3117, 3118, 3161. Scientists 1965. N.P. Kravkov, 1865-1924, pharmacologist; P.K. Sternberg, 1865-1920, astronomer; Ch Valikhanov, 1835-1865, Kazakh scientist; V.A. Kistjakovski, 1865-1952, chemist. 1965.