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To find books on a topic, search Horizon by author, title, subject headings, or keyword. To find books by a particular author/person, search Horizon by author: guevara, che garcia marquez, gabriel To find books about a particular author/person, search Horizon by subject heading: guevara, ernesto, 1928-1967 garcia marquez, gabriel, 1928- To find books on a topic, use a keyword boolean search if you do not know the correct subject heading for a topic. Think of the focus (or key) words that describe your topic.