le to find some fairly obscure books on Chegg through their incredibly easy interface. A search for an old colleague (I use the term colleague loosely; at the time, he was chair of the Biostatistics Department at the Johns Hopkins School of Public Health and I was a mere statistical programmer, but still…) turned up his book on the analysis of gene expression data (among several others) for half the price of a new copy.
The service also buys used textbooks you already own, going so far as to provide you with free UPS shipping labels and planting a tree for every book you sell.
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