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by nosioptar 1 day ago
I used several of their books in school. Each of them was top notch.

Hell, their math books are better than the paid books I used.
1 comments
helterskelter 1 day ago
I'm glad to hear that, I just ordered their astronomy book the other day! The online/PDF material looked good but I hate diving into something unless it's on paper.
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nosioptar 1 day ago
I've seen a couple printed books from them. They all seemed to be a pretty good quality print.
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