What kind of numbering system on books do most college libraries use?

dewey decimal systemWhat kind of numbering system on books do most college libraries use?
Academic Libraries can use either. However the majority use the Library of Congress system. Which has several advantages in terms of specific classifications. And therefore lends itself better to large collections.What kind of numbering system on books do most college libraries use?
most colleges and universities use the library of congress numbering system. it's easy to learn, ask the librarian for help.
Dewey is the only one I've seen my universities using...