The World's Biomes http://www.ucmp.berkeley.edu/glossary/gloss5/biome/
Exploring the Environment. http://www.cotf.edu/ete/modules/msese/earthsysflr/biomes.html
Enchanted Learning Biomes-Habitats http://www.enchantedlearning.com/biomes/
Missouri Botanical Gardens. http://mbgnet.mobot.org/
World Biomes http://www.worldbiomes.com/default.htm
World Book Online Reference Center http://www.worldbookonline.com