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<p>While I agree that PR rankings are useless, I don’t think it’s possible to assemble a ranking of the “best” college libraries unless you define best solely by criterion 1). Criteria 2) and 3) are, in my personal experience–from making the special effort to visit every single library at the 20+ schools I’ve visited–NOT universal across all top universities. However, the differences are in subjective details. For example, lots of people love Cornell’s library; I find the setting sterile and cold, though modern and clean. Wrt accessibility, consider various library consortia (speed of ILL, more/less books available than evident from data) and library policies like open/closed stacks (I prefer the former, because it helps with topical research) or the food policy (being able to snack while studying is a plus).</p>