MALDIVES (1972) Globe*. Environment symbol*. "Only One Earth". Set of 5 imperforate pairs. Scott Nos 412-6, Yvert Nos 398-402. UN Conference on Human Environment.
AVAILABLE AT $100
BELGIUM (1967) Birches. Trientalis. Sand dunes. Flowers. Set of 2 imperforates. Scott Nos 684, Yvert Nos 1408-9. Nature preservation.
AVAILABLE AT $25
BELGIUM (1974) Environmental protection. Imperforate. Scott No 864, Yvert No 1700.
AVAILABLE AT $10
MALI (1979) Map of Mali in green. Imperforate corner block of 4. Project Green Sahel. Scott No 338, Yvert No 344.
AVAILABLE AT $20