Was it a paper old enough to be in the public domain? I just did some spot-checking, and everything I've checked that's old enough is available with no paywall. For example, looking at the American Journal of Archaeology (http://www.jstor.org/action/showPublication?journalCode=amer...), the issues from 1922 and earlier show up for me as free, while the 1923-and-later issues are paywalled.
It's absurd that copyrights are so lengthy that 1923 is the cutoff point, but that's a whole other can of worms.
