Review the twenty-one Library of Congress Classification and its subclass outline at: http://www.loc.gov/catdir/cpso/Icco/Icco.html Books on a particular subject are shelved together by their corresponding designated letter. Remember that variance in the focus of a subject may result in books on a particular subject being cataloged under different sections of the Library of Congress classification system. For this practice, you need to select the MOST appropriate classification letter when answering the following questions: