Determining Limiting Magnitude
ASO Telescope Limiting Magnitude Chart
Limiting Magnitude Field Locator and Calculator
Prairie Astronomy Club Light Pollution Fact Sheet
Visual Limiting Magnitude Calculation-Java Script
Groups and Organizations working to save your skies - you Should Join:
IDark Sky Society of Long Island
International Dark Sky Association
The New England Light Pollution Advisory Group (NELPAG)
Outdoor Lighting Associates, Inc.