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Birth Centenry of A.M.Lyapunov.

Date of issue: 20th June 1957



Designer: E. Bulanova
Paper: ordinary
Printing process: photo
Perforation: line 12 1/4
Size: 18 x 26 mm
Sheet composition: 200 (20 x 10) stamps
Printing run: 1.000.000
Michel catalogue number: 1955

40 K. red-brown. Portrait of mathematician A. M. Lyapunov (1857-1918)


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