Your headline appears to place a hard-and-fast rule, which you elaborate upon by talking about how important it is that all but the longest content remain above the fold on your library website.

If you approach content from the stance that it should be no taller than an arbitrary height (say, 600px for the common 1024×768 screen resolution, the page header, and some browser chrome), then your content can conceivably be crammed, awkward, and perhaps be set in too small of type.

On the other hand, if you write content conscious that people read less on the web than they do in print form, that they’re most likely to scan (especially headlines, images, and bold text), that the most important information should be at the top in a sensible IA, and that white space, consistent typography, and sensible layout are more pleasing and inherently readable, then you’ll produce content suited to the reader.

I am not saying that trying to keep content above the fold shouldn’t be A consideration, just that it shouldn’t be such a priority that you’d deem yourself a ‘fascist’ for the cause.