4th Latin American Geological Congress issue of Trinidad & Tobago
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Short desc: 4th Latin American Geological Congress
Issuer: Trinidad & Tobago Date: 7/3/1979 Occasion: 4th Latin American Geological Congress Consists of 4 stamps: (See stamps as list) 10c d=Geothermal Exploration 35c d=Hydrogeology 45c d=Petroleum Exploration 70c d=Environmental Preservation All are wmk=mult crown & script CA |
