NORTH KOREA (1994) Air pollution - World Environment Day*. Deluxe proof. KSC No 3501, Michel No 3631.
AVAILABLE AT $50
NORTH KOREA (1994) Hydroelectric Dam*. Water pollution - World Environment Day*. Deluxe proof. KSC No 3502, Michel No 3632.
AVAILABLE AT $50
NORTH KOREA (1994) Deer*. Gun*. Protect Animal Resources - World Environment Day*. Deluxe proof. KSC No 3503, Michel No 3633.
AVAILABLE AT $50
NORTH KOREA (1994) Forest*. Fire*. Protect Forest Resources - World Environment Day*. Deluxe proof. KSC No 3504, Michel No 3634.
AVAILABLE AT $50
SENEGAL (1979) Bottles of mercury*. Fish*. Deluxe sheet. Scott No 498, Yvert No 506.
AVAILABLE AT $20
FRANCE (1996) Fish*. Mediterranean Sea*. Bloc gommé. Accord Ramoge. Scott No 2524, Yvert No 3003.
AVAILABLE AT $75