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Spectroscopy websites
ww.astrosurf.com/buil
http://www.astrosurf.com/vdesnoux/
http://astrospectroscopy.de/
http://www.threehillsobservatory.co.uk/astro/astro.htm
Vereinigung der Sternfreunde Fachgruppe
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ARAS Spectroscopy forum
Photometry websites
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the Solar Explorer
705nm Solar imaging
http://brierleyhillsolar.blogspot.com/
Greek amateurs
Geomagnetism tutorial
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imgalt
BASS