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I came to Haynes manuals late in life (early 30s) but greatly appreciated them. I hope there are still some youngsters who are as motivated about things mechanical and not just gaming software. I didn't know his story.
https://www.theguardian.com/technology/2019/feb/21/john-haynes-obituary
https://www.theguardian.com/technology/2019/feb/21/john-haynes-obituary