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H H1 HA HB HC HD HE HF HG HJ HM HN HQ HS HT HV HX

ลำดับที่	LC	คำอธิบาย
101		Labor policy. Labor and the state
102		Labor in politics. Political activity of the working class
103		Professions (General). Professional employees
104		By industry or trade
105		By region or country
106		Agricultural industries
107		Special industries and trades
108		Energy industries. Energy policy. Fuel trade
109		Mineral industries. Metal trade
110		Chemical industries
111		Pharmaceutical industry
112		Mechanical industries Including electric utilities, electronic industries, and machinery
113		Construction industry
114		Manufacturing industries
115		Miscellaneous industries and trades
116		Transportation and communications
117		Railroads. Rapid transit systems
118		Freight (General)
119		Passenger traffic (General)
120		Urban transportation
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