Charles Ammi Cutter: A Biographical Sketch - Biography of Charles Cutter, the librarian and cataloger who invented Cutter Numbers, used to adapt subject classification systems to individual libraries.
Wikipedia: Charles Ammi Cutter - Information about Charles Ammi Cutter, the 19th century librarian who developed Cutter Numbers, a system of alphabetic tables used to abbreviate authors' names and generate unique call numbers.
