My vagabond travels have revealed that local public libraries use the Dewey Decimal system, and the few college libraries I have surveyed use the Library of Congress system. the
New York Public Library main library at 42 Street and Fifth Avenue is a research library that I do not use, because it is inconveniently located for me, and the books are not brows-able by the public.
In any event, I believe, both the Dewey and the library of Congress classification systems are antiquated systems and can be replaced with systems that better represent the perceptual arrangement of human knowledge, and cataloguing using systems that computers can manage that people were unable to imagine to be possible decades ago.
I have devised a system that I believe is very accurate in it's representation of the arrangement of knowledge, and I believe it is versatile enough to be able to be customized to meet the needs of local communities that may view things to be arranged differently and/or categories designated differently. My system was devised primarily to be used for classifying personal computer document (My Documents) storage. But it is very possible to apply it to public library systems, and I think that the ability for people to be able to "synchronize" their PC documents classification with their local community knowledge center (library), and eventually, their Internet search engines, is a step in the direction that will lead to the better evolution of society; because it basically comes down to aligning "logic."
So, let's first take a look at the Dewey Decimal and library of Congress systems' primary domains, and what we can do with them, as far as understanding a logical sequence....