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Re:Ask HN: Where to start for hobby circuit design by gabrielsroka on Saturday January 30, 2021 @10:19PM (#25975510)
Some of them are available online.

https://archive.org/search.php?query=forrest%20mims

Re:Ask HN: Where to start for hobby circuit design by yesenadam on Monday February 01, 2021 @07:11PM (#25995910)
Wow, they are really awesome. Thank you both!