(4663) BERLIN 1974 : Sc# 9N345 GUSTAV KIRCHHOFF PHYSICIST - MNH VF
(2387) BERLIN 1971 : Sc# 9N314 HERMANN VON HELMBOLTZ SCIENTIST PHYSICIAN - MNH VF
(1081) DDR 1965 : Sc# 753 WILHELM CONRAD ROENTGEN RÖNTGEN PHYSICIST DISCOVERER OF X-RAYS - MNH VF
€1.00
(1081) DDR 1965 : Sc# 753 WILHELM CONRAD ROENTGEN RÖNTGEN PHYSICIST DISCOVERER OF X-RAYS - MNH VF
€1.00
(1081) DDR 1965 : Sc# 753 WILHELM CONRAD ROENTGEN RÖNTGEN PHYSICIST DISCOVERER OF X-RAYS - MNH VF
(804) DDR 1958 : Sc# 383-384 MAX PLANCK PHYSICIST SELF-PORTRAIT AND SIGN SYMBOLIZING QUANTUM THEORY - MH