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A well thought out keyword search can help you find many relevant books in our catalogue, but to find more on topic, in a more efficient way, use the Subject Headings ascribed to each book. These are am authorized thesaurus of terms, and don't rely on the words the author used to describe the topic. Find one book that seems useful, then click on whichever of its subject headings are relevant to your research question. You'll find more books on that topic.