Bulgaria 3569-3574, 3575

Bulgaria 3569-3574, 3575, MNH, $4.35. Michel 3870-3875, 3876 Bl.213. Space exploration, 1990. Sputnik, 1957; Vostok, 1961; Voskhod 2, 1965, USSR; Apollo-Soyuz, 1975 USA-USSR; Columbia, 1981; Galileo, 1989-1996, USA. 20th Ann. of Apollo 11 Moon's Mission, 1990. Blocks of 4 and 4 souvenir sheets - buy 4 sets (1).