Sou    | 
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 sources    | 
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 | SN | A valid general term through 1978. |  
 South American Atlantic    | 
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 | SN | No longer a valid term for GeoRef. Used from 1981-1994 for southwestern Atlantic bounded on the on the east by the Mid-Atlantic Ridge, and on the north by a line drawn between Cabo de Sao Roque, Brazil to Cape Palmas, Liberia. See South Atlantic. |  
 South American Pacific    | 
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 | SN | Used from 1981-1994 for a region in the southeastern Pacific bounded on the north by the equator, on the east by South America, on the south by approximately 55#DGS, and on the west by the East Pacific Rise. See Southeast Pacific. |  
 South American Plate    | 
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 | RT | Chile Margin Triple Junction |  |   | plate tectonics |  |   | plates |  |   | South America |  | SN | Includes the South American continent (excluding a small portion in the Caribbean Plate) and part of the Atlantic Ocean W of the Mid-Atlantic Ridge. Extends northward to the Caribbean region and southward to the Scotia Ridge. Indexed with geographic area |  
 South Atlantic Ridge    | 
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 | SN | No longer a valid term for GeoRef. A valid term from 1981-1994. After 1994, use Mid-Atlantic Ridge and South Atlantic. |  
 South Polynesian Pacific    | 
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 | SN | No longer a valid term for GeoRef. Used from 1981-1994 for a region in the southeastern Pacific bounded on the east and south by the East Pacific Rise and the Pacific-Antarctic Ridge, and on the west by a line extending from the southern end of Macquarie |  
 South Sea Islands    | 
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 | SN | Not a valid GeoRef index term after 1968. See Oceania; West Pacific Ocean Islands; East Pacific Ocean Islands. |  
 South-Central China    | 
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 | SN | No longer a valid term for GeoRef. See provinces: Hubei China, Hunan China, Guangxi China, and Guangdong China. Henan China and Hainan China were considered part of this region for 1992. |  
 Southeastern Nigeria    | 
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 | SN | No longer a valid term for GeoRef. Valid 1981-1992. |  
 Southeastern U.S.    | 
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 | BT | United States |  |   | .Eastern U.S. |  |   | ..Southeastern U.S. |  | SN | As of 1993, term is used only for broad general discussions. See United States or individual states to search those areas. Added to Thesaurus in 1985. |  
 Southern Ocean    | 
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 | SN | Not a valid term for GeoRef. Index Antarctic Ocean where waters include parts of the Atlantic Ocean, Pacific Ocean and Indian Ocean south of approximately 55#DG S. |  
 Southern Uplands    | 
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 | RT | England |  |   | Florida |  |   | Nova Scotia |  |   | Scotland |  |   | Southern Highlands |  | SN | Between the Scottish Lowlands to the N and the Cheviot Hills on the English border to the S. Also used in Florida and in Nova Scotia. Indexed with counties or regions as applicable. |  
 Southern Yemen    | 
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 | USE | Yemen |  | SN | Former Peoples Democratic Republic of Yemen. United with Yemen Arab Republic in 1990. |  
 Southwestern China    | 
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 | SN | No longer a valid term for GeoRef. Used as a regional term from 1985-1992. Now see Guizhou China, Sichuan China, Yunnan China and Xizang China. |  
 Southwestern U.S.    | 
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 | BT | United States |  |   | .Southwestern U.S. |  | SN | As of 1993, term is used only for broad general discussions. Before 1978, also search United States AND (southwest OR southwestern). For complete search, also search states. |  
 Southwestern USSR    | 
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 | SN | No longer a valid term for GeoRef. As of 1993, see Commonwealth of Independent States. Before 1978, search USSR AND (southwest OR southwestern). |  
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