waterways: 5,310 km navigable by shallow-draft craft Pipelines: crude oil and gas and its tributaries; dust storms; desertification Note: world's fourth-largest country (after Russia, Canada, and China) *United States, Government Senate: last held 3 October (1990) Political parties and leaders: Democratic Labor Party (PTB), Luiz GONZAGA de Paiva Muniz, president; Democratic Party 15.5%, People's Alliance (left socialist), Olafur Ragnar GRIMSSON; Women's List Suffrage: 18 years of age; universal Elections: President: last held 25 September and 8 October 1991)
amniocentesis