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1. World (Ground Surface Elements, 2004)

Tobin International and USGS. Ground surface elements, such as sand or lava, from the Physiology layer of the DCW. This data is part of the Digital Chart of the World dataset in... Tobin.

2. World (Swampland, 2004)

Tobin International and USGS. Swampland area data from the Vegetation layer of the DCW. This data is part of the Digital Chart of the World dataset included with the Tobin Globa... Tobin.

3. World (Trees, 2004)

Tobin International and USGS. Forested areas from the vegetation layer of the DCW. This data is part of the Digital Chart of the World dataset included with the Tobin Global Pla... Tobin.

4. World (Tundra, 2004)

Tobin International and USGS. Tundra areas from the Vegetation layer of the DCW. This data is part of the Digital Chart of the World dataset included with the Tobin Global Plann... Tobin.

5. World (World Wildlife Fund Ecoregions, 1998)

Environmental Systems Research Institute, Inc. (ESRI), World Wildlife Fund , and World Wildlife Fund. World Wildlife Fund Ecoregions represents global terrestrial and freshwater ecoregions defined as relatively large areas of land or water in the wo... World Wildlife Fund.