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Amateur Contributions to Science@  (9)

American Association of Variable Star Observers - The largest organization for variable stars: provides professional and amateur collaboration, research, and analysis of variable star observations.
Astronomical Society of South Australia - ASSA's variable star group. News, FAQ, charts, and software.
Astronomy On-Line - Collaborative Project aimed at getting new people involved in variable star observing.
Brigham Young University Variable Star Database - Currently contains 311 stars which have been classified as Delta Scutis or Gamma Doradus in some published source.
The Cepheid Distance Scale: A History - A critical review of the Cepheid distance scale, from its inception, to the Hipparcos mission and beyond.
General Catalog of Variable Stars Research Group - Research group working on the GCVS, Sternberg Astronomical Institute, Moscow, Russia. Includes catalogs and publications.
Information Bulletin on Variable Stars - The IBVS is a bulletin of Commissions 27 and 42 of the International Astronomical Union, published by Konkoly Observatory, Budapest, Hungary.
The Minima of Algol - An article by Alan MacRobert from Sky and Telescope Magazine about the star Algol (Beta Persei) was the first eclipsing variable star ever discovered.
A Ritzian Interpretation of Variable Stars - A study on the nature of the speed of light in space using light curves and spectroscopic observations of variable stars as evidence.
Skyandtelescope.com - Variable Stars - Observing variable stars.
The Top Twelve Naked-Eye Variable Stars - An article by John Isles from Sky and Telescope Magazine.