Wilhelm Beer: Perbedaan antara revisi
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{{Commonscat|Wilhelm Beer}}
* http://humbabe.arc.nasa.gov/mgcm/fun/mars_chro.html {{Webarchive|url=https://web.archive.org/web/20040208043324/http://humbabe.arc.nasa.gov/mgcm/fun/mars_chro.html |date=2004-02-08 }}
* http://www.uapress.arizona.edu/onlinebks/mars/chap04.htm {{Webarchive|url=https://web.archive.org/web/20170701062415/http://www.uapress.arizona.edu/onlinebks/MARS/CHAP04.HTM |date=2017-07-01 }}
* 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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