As usual, the internet complicates things. Back in the day when books and journals were printed on expensive paper, every author had to convince an editor or peer review committee that her work was worth chopping down a bunch of trees and paying typesetters... or cough up a few thousand bucks to a vanity publisher. And even with that barrier in place, 90% of what came out was crap.
But now we have e-publishing, and anyone with an internet account can self-publish. On the plus side, there's a boom in low-cost open access academic publishing, which many hope will break the cycle of spiraling journal costs. On the minus side, every yahoo on the planet can now "publish" their old family recipes, conspiracy screed, or erotic fanfic. There's even a whole new breed of "predatory publishers," companies who go a step beyond the old vanity presses with aggressive and misleading marketing and/or rampant plagiarism.
Of course libraries do their best to avoid this kind of stuff, but when this much crap is flooding the world it occasionally slips by and shows up in academic databases. Even top libraries (yeah, that would be us) have been known to accidentally buy books which turn out to be Wikipedia articles printed out.