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A comment on A plea for lean software (1995) [pdf]. Parent comment
As far as github mirrors, I'm not sure there is one. But this looks interesting: https://github.com/Spirit-of-Oberon/ProjectOberon2013
But you may just want to get the original code and read through the books at http://www.projectoberon.com/
As far as github mirrors, I'm not sure there is one. But this looks interesting: https://github.com/Spirit-of-Oberon/ProjectOberon2013
But you may just want to get the original code and read through the books at http://www.projectoberon.com/