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→Weblinks englisch
*http://contrailscience.com/contrail-or-chemtrail/
*http://contrailscience.com/contrail-or-chemtrail/
*http://www.af.mil/shared/media/document/AFD-051013-001.pdf
*http://www.af.mil/shared/media/document/AFD-051013-001.pdf
*http://www.hans-egebo.dk/skeptic/contrails.htm
*http://www.env.leeds.ac.uk/envi1200/slides/Chapter%209.pdf zur Contrail-Entstehung
*http://www.env.leeds.ac.uk/envi1200/slides/Chapter%209.pdf zur Contrail-Entstehung