Try the Keyword search to find the name of an ethnic group anywhere it appears. Also try the Keyword search option for books to find specific chapters listed in contents notes, or for names of peoples mentioned in the title, but not in the subject heading:
Keyword search for BASQUE* finds books including one called The Spanish World, which has a chapter called, "The Basque Country."
Keyword search for INDIA and ETIQUETTE finds books including one called Passport India : your pocket guide to Indian business, customs & etiquette.
Use truncation characters to find all the words that start with the same letters. The truncation character for the library search is an asterisk, "*" (Example: cultur*).
For guidance on subject headings used in the library search, consult Library of Congress Subject Headings (Reference 025.49 L61), or try Library of Congress Authorities.