Wilhelm Beer: Perbedaan antara revisi
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Baris 37:
* http://humbabe.arc.nasa.gov/mgcm/fun/mars_chro.html
* http://www.uapress.arizona.edu/onlinebks/mars/chap04.htm
* http://www.exploringmars.com/history/1800.html {{Webarchive|url=https://web.archive.org/web/20070822203214/http://www.exploringmars.com/history/1800.html |date=2007-08-22 }}
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