How to Create an Automatic Cobblestone Generator in Minecraft « Minecraft :: WonderHowTo
How to build a cobblestone generator in Minecraft - Quora
1.14.4] Why does this cobblestone generator not work? this design used to work fine but whenever i do it nowadays the water flows too fast and turns the lava to obsidian :
How to Build a Cobblestone Generator « Minecraft :: WonderHowTo