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Math Book Bundle - mwthomasjr - 04-20-2020 06:21 PM
Don't know if any of these are good but the Humble Bundle has a math book bundle,
Humble Book Bundle: Applied Math Productivity by Mercury Learning,
available for $1 to $15 in 3 tiers, or more if you want to contribute more to a charity.
There are 25 math books in PDF. mobi, or epub.
The web site is https://www.humblebundle.com/books/applied-math-productivity-mercury-learning-books