Columbia subject headings:
Ethnology--India--Hesag.
Heavy Engineering Corporation.
Hesag (India)--Economic conditions.
Hesag (India)--Social conditions.
Industries--India--Hesag.
Harvard subject headings:
Bihar (India)--Economic conditions.
Bihar (India)--Social conditions.
Ethnology--India--Hesag.
Heavy Engineering Corporation.
Hesag (India)--Economic conditions.
Hesag (India)--Social conditions.
Industries--India--Bihar.
Industries--India--Hesag.
Princeton subject headings: