This category is listed under
Formal Sciences because, although it is interdisciplinary, at its core
it deals with classification and organizational schemes for information.
Even in the case of
physical libraries with books, the primary underlying principles consist
in the filing system such as the Dewey Decimal Classification.
Thomas Jefferson, whose personal library eventually became the U.S. Library of Congress, classified his books by subject rather than alphabetically, based on Francis Bacon's scientific method.
These examples illustrate the informational basis of Library and Information Science (LIS).