Douglas Powell
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I've used this book over the years and found it to be invaluable when first setting up a silicon compound potting lab for high voltage assemblies.
Encapsulation of Electronic Devices and Components
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This one is tough enough for now, I actually have to jot. It has a few unexpected twists along the way and I did find one that I think is an invalid puzzle, confirmed with software, on puzzle #74.
Genius-Level Sudoku: Over 300 Super-Difficult Puzzles from the Japanese Masters Who Invented the Game
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