Columbia subject headings:
Karakalpakstan (Uzbekistan)--History.
Labor--Uzbekistan--Karakalpakstan.
Harvard subject headings:
Kara-Kalpak (Uzbek S.S.R.)--History.
Karakalpakstan (Uzbekistan)--History.
Labor--Uzbekistan--Kara-Kalpak.
Labor--Uzbekistan--Karakalpakstan.
Working class--Uzbekistan--Karakalpakstan.
Princeton subject headings:
Kara-Kalpak (Uzbek S.S.R.)--History.
Labor--Kara-Kalpak (Uzbek S.S.R.).