| Issuer: Trinidad & Tobago
Issue: 4th Latin American Geological Congress Date: 7/3/1979 (1979 sheets) Block 1 (4, 4 x 1) 1, 1: 10c d=Geothermal Exploration 1, 2: 35c d=Hydrogeology 1, 3: 45c d=Petroleum Exploration 1, 4: 70c d=Environmental Preservation |
External links: Colnect 546406..dad_and_Tobago |
