What if a patron wants to find books on a certain subject?

Library of Congress Classification System: L

L     Education (Level 3)

L: Education (General)

LA: History of education

LB: Theory and practice of education

LC: Special aspects of education

LD: Individual institutions - United States

LE: Individual institutions - America (except United States)

LF: Individual institutions - Europe

LG: Individual institutions - Asia, Africa, Oceania

LH: College and school magazines and papers

LJ: Student fraternities and societies, United States

LT: Textbooks