Covers tagged "science" (clear filter)

Einstein 15-cent Commemorative with GAMM Physics Cachet
Einstein 15-cent Commemorative with GAMM Physics Cachet
Albert Einstein 15-cent Commemorative, Milcopex 1979
Albert Einstein 15-cent Commemorative, Milcopex 1979
Theodore von Karman Aerospace Scientist 29¢ Stamp
Theodore von Karman Aerospace Scientist 29¢ Stamp
Theodore von Kármán - Aerospace Pioneer, Scott 2699
Theodore von Kármán - Aerospace Pioneer, Scott 2699
Aryabhata 1975 – India's First Satellite
Aryabhata 1975 – India's First Satellite
1992 Minerals Series - Azurite 29¢ with GAMM Cachet
1992 Minerals Series - Azurite 29¢ with GAMM Cachet
Theodore von Kármán Pioneer Aerospace Engineer
Theodore von Kármán Pioneer Aerospace Engineer
1992 Minerals Issue - Four 29¢ Stamps
1992 Minerals Issue - Four 29¢ Stamps
1992 Minerals Plate Block - GAMM Cachet
1992 Minerals Plate Block - GAMM Cachet
Joseph Priestley 20-Cent Stamp, First Day of Issue
Joseph Priestley 20-Cent Stamp, First Day of Issue