Clicking the hyperlink will perform a search in the Online Catalog. (or you can do manually by typing the search term using "Subject browse" in the Online catalog)
History and culture
Asia, Central
Asia, Central--History.
Asia, Central--Civilization (use this for Culture in general)
Asia, Central--Politics and government
Asia, Central--Languages
Languages (do also a subject browse cataloig search also under the name of the individual languages, in the form X language, e.g. Tajik language Grammar, Tajik language History, etc.) See also my Linguistics guide for my assistance with Linguistics topics
Turkic languages
Iranian languages