Columbia subject headings:
Ludhiana (India : District)--Population.
Migration, Internal--India--Ludhiana (District)
Migration, Internal--India--Punjab.
Punjab (India)--Population.
Harvard subject headings:
Ludhiana (India : District)--Population.
Migration, Internal--India--Ludhiana (District)
Migration, Internal--India--Punjab.
Punjab (India)--Population.
Princeton subject headings:
Ludhiana (India : District)--Population.
Migration, Internal--India--Ludhiana (District).
Migration, Internal--India--Punjab.
Punjab (India)--Population.