USGS Water Science for Schools *Great Resource for general information about fresh water quality and use*
USGS Water Resources
How Stream Flow is Measured
EPA Office of Groundwater and Drinking Water
Surf Your Watershed
Safe Drinking Water Information
The SOS Macroinvertebrate Key
Pond Life Identification Kit
Unit Conversion Calculators
Unit Conversion Calculator
Need Help Finding Your Latitude and Longitude?
How Far is It? Enter place name in "From" section. Will give latitude and longitude for most world wide locations
Geographic Name Server Mostly U.S. cities but some foreign cities
GEOnet name server for some foreign cities (under "Access GEOnet").