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History
25
Histoire
21
BUSINESS & ECONOMICS
9
Industries
5
General
4
POLITICAL SCIENCE
4
TRANSPORTATION
4
Conditions sociales
3
Documentary photography
3
Labor
3
Labor & Industrial Relations
3
Photographie documentaire
3
Prisons
3
Railroads
3
Social conditions
3
Automobile industry and trade
2
Automobiles
2
Chemins de fer
2
Defense industries
2
Guerre mondiale, 1939-1945
2
Industrie et commerce
2
Industrie militaire
2
Jails
2
Labor movement
2
Labor unions
2
Military Science
2
Mouvement ouvrier
2
Photography
2
Pictorial
2
Public Transportation
2
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