Found in 2 comments on Hacker News
mindcrime · 2020-03-10 · Original thread
There's this book I like called "Guesstimations in the back of a napkin" or something

This? https://www.amazon.com/Guesstimation-Solving-Worlds-Problems...

dedalus · 2009-11-15 · Original thread
I read http://www.amazon.com/Guesstimation-Solving-Worlds-Problems-... and the attached link delves into far greater theory than the book.

Thank you for sharing this with us :-)

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