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They are still available as PDFs at https://github.com/observablehq/plot-cheatsheets, but they are no longer maintained or supported. If you want the notebook you could take a look at any of the forks: https://observablehq.com/@observablehq/plot-cheatsheets/forks

Thanks Fabian

the embed views are also still available! https://observablehq.com/embed/@observablehq/plot-cheatsheets