SUBJECTS:
< INDUSTRY >
< STRUCTURES >
< PEOPLE >
< NATURE >
< COUNTRIES >
< CITIES >
< OTHERS >
Sub-subjects:
< WORKERS >
< Building workers >
< Clerks >
< Craftsmen >
< Dealers >
< Farmers >
< Fishermen >
< Office clerks >
< INDUSTRIAL WORKERS >
< TRANSPORT WORKERS >
