I made a fully automatic cobblestone generator and harvester. Terribly inefficient, but very fun. : r/Minecraft
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How to Create an Automatic Cobblestone Generator in Minecraft 1.5.0 : 20 Steps - Instructables
Easy early game auto cobblestone farm (no slime or coral) : r/technicalminecraft
Automatic Cobblestone Generator Minecraft Map
How to create an automatic cobblestone farm in Minecraft
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Automatic cobblestone generator using only Quark and vanilla redstone (1.14.4) : r/feedthebeast