‹ xkcd: Rock Identification ›
• Source
> https://xkcd.com/3068/
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• Ghostarchive
> https://ghostarchive.org/archive/h3fbJ
• archive.today
> https://archive.ph/wip/wUXwP
• Telegraph
> https://telegra.ph/xkcd-Rock-Identification-03-27
• Internet Archive
> https://web.archive.org/web/20250327045227/https://xkcd.com/3068/