the Spanish-American Institute uses the Dewey Decimal System of classification to catalog books and arrange them on shelves according to subject or form.  Dewey Decimal System call numbers always begin with numbers.  For example, the call number 822.33 is the classification or call number for The Norton Shakespeare in the Spanish-American Institute Library and other libraries using the Dewey Decimal System.  Many other libraries use the Library of Congress (LC) classification system which always begins with letters followed by numbers.  See also " Call Number," above.

The part of a call number, usually a combination of letters and numbers, used to classify items by subject area.

A 10-digit number, assigned to goods enumerated in the Schedule to the Customs Tariff that identifies imported goods. Also referred to as the Harmonized System or HS number.