MONACO (1972) Three stages of environment (before, during and after pollution)*. Full sheet of 10 trial color proofs. Scott No 827, Yvert No 881.
AVAILABLE AT $250
SENEGAL (1980) Planting trees*. Set of 9 progressive proofs including final colors. Scott No 530.
AVAILABLE AT $50
MAURITANIA (1985) Grain harvest*. Set of 3 progressive proofs including final colors. Fight against desert encroachment. Scott No 589.
AVAILABLE AT $25
MAURITANIA (1985) Planting brush*. Set of 3 progressive proofs including final colors. Fight against desert encroachment. Scott No 591.
AVAILABLE AT $25