MALI (1981) Pierre Curie*. Lab equipment*. Full sheet of trial color proofs. Discovery of radium. Scott No 424, Yvert No 428. Spectacular item!
AVAILABLE AT $400
FRANCE (1982) Frédéric et Irène Joliot-Curie*. Diagrammes de radiation*. Yvert No 2218. Scott No 1838. Essais de couleur.
AVAILABLE AT $15
PANAMA (1965) Nuclear powered space vehicle*. Imperforate essay in unissued colors. Scott No 460e, Yvert No PA353.
AVAILABLE AT $50
GABON (1967) Atomic symbol*. Trial color proofs in strip of 5. IAEA. Scott No 216, Yvert No 215.
AVAILABLE AT $80