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EarthTrends Environmental Information
Elemental Data Index
Math Forum
Measure 4 Measure
NASA
Nationalgeographic.com
NIST Chemistry WebBook
North American Mammals
Plants Database
PubChem
ScienceWorld
TechWeb: TechEncyclopedia
U.S. Naval Observatory. Astronomical Applications Department: Data Services
Water Resources of the United States
WebElements Periodic Table
Web Design References
Webopedia