A sample list of Library of Congress (LC) subject headings for African Studies is found below. Many general subjects can also be broken down geographically or by ethnic group, eg. Decorative arts, Fula; Women, Zulu.
African languages (see also under the names of individual languages or groups of language
Hausa (African People)
Africa West (see also under other geographic sub-divisions including the names of individual countries) Some typical sub-headings are
Africa, West-colonization
Africa, West-Description and travel
Africa, West-Economic conditions
Africa, West-History (divided by time period)
Africa, West-languages
Remember you can do a keyword search in Library Search to locate books on your topic and then search on the subject headings of relevant titles