Nigeria 1982 Robert Koch's Discovery of Tubercle Bacillus set of 3 unmounted mint, SG 431-33*
Nigeria 1982 Robert Koch's Discovery of Tubercle Bacillus set of 3 unmounted mint, SG 431-33*
Nigeria 1982 Robert Koch's Discovery of Tubercle Bacillus set of 3 unmounted mint, SG 431-33*