History 622 Pictorial works 445 Working class 262 Collected works 189 Work 186 Social conditions 123 Social aspects 118 Social life and customs 118 Work environment 96 Psychological aspects 85 Early works to 1800 84 Field work 79 Metal-work 78 Women 74 Photography, Artistic 70 History and criticism 67 Popular works 66 Employment 62 Politics and government 59 Work groups 59 REFERENCE WORKS 57 Work and family 57 ART 56 Group work in education 53 Management 51 Public works 49 Design 46 Research 42 Fashion 41 Quality of work life 41