Try to make the most out of the subject headings in the library catalogs. Some examples of official subject headings are listed below:
Subject headings can be subdivided in one or more elements. The first element is the main heading and tells you what the book is about; the subsequent elements are called subdivisions, they follow the main heading, and add specificity to the main topic.
Some subdivisions can be very helpful for improving your research. Here are some examples:
Geographical context might also be used to narrow down the search:
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