3 ms·That's not too bad considering the content is equivalent to a first year graduate course textbook.by infinite8s 10y agoThat's not too bad considering the content is equivalent to a first year graduate course textbook.ska 10y agoWhich would likely cost $200 or so new, in current textbook market. So $22 is a bit better than "not too bad".iaw 10y agoIt's awesome that it's freely available.