So I wandered into a charity book shop expecting not a lot. What sits in front of me was an engineering reference book still useful in the modern world for more than my legacy machinery fixing/recreation* operations. This is also one that gets very expensive compared to how things were in years past so I was there thinking this is going to hurt, especially following a holiday and Christmas and several birthdays.
Nope £1.99, and another few books elsewhere on the day but that was the big one.
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*I did also find a few books on old Victorian era ironmongery items (you can buy a carpeted footrest for your carriage wouldn't you know) and domestic bygones which will likely be remade when I get the forge up properly.