Answer:
2 Main Library Classification Systems:
➡️ first classifies books into nine broad categories, each identified by a number in the hundreds.
- The Library of Congress System
➡️ has 21 broad categories, each represented by one letter of the alphabet.
Explanation:
The Library of Congress system is an outline, much like one you would use to organize an essay. Subtopics are dealt with by indentation. The Dewey Decimal system is a hierarchy: Subtopics are dealt with by using hundreds, then tens, then units and then decimal places.
The Dewey Decimal System is used by more libraries, but the Library of Congress system is used by some of the biggest libraries -- most obviously the Library of Congress itself. Many universities use the Library of Congress system, but public libraries mostly use the Dewey Decimal System.
