Hungary 1659-1667 mlh

Hungary 1659-1667, lightly hinged, $2.85. Michel 2101-2109, Euros 4.50. International Quiet Sun Year IQSY-1964-1965. Arctic Exploration, Helicopter, Ionosphere, Atmosphere research, Radar, Rocket and Earth, reflecting layer diagrams, Telescope, Map of Milky Way, Radio astronomy, Earth magnetism, Compass rose, Weather balloon, lighting, Meteorology, Aurora borealis, penguins, Arctic research, Satellite, Planets, Spase research, World map. Sun with flares and corona, Snow crystals, Rain.