Imagine you were starting a library and you had a few thousand books, magazines and other materials. How would you organize all those sources so people could easily find things? What if your collection grew to a few million items? Could your collection logically adapt and expand?
Most libraries organize its collections by subject. They use either the Dewey Decimal Classification System or the Library of Congress Classification System (LC). The Beam Library uses the the Library of Congress System. LC uses call numbers that begin with letters.