Published from 1920 to 1974, the series is organized as follows:
| Series A | Industrial Relations |
| Series B | Economic Conditions |
| Series C | Employment and Unemployment |
| Series D | Wages and Hours |
| Series E | Disabled |
| Series F | Industrial Hygiene |
| Series F | Safety |
| Series G | Housing and welfare |
| Series H | Co-operation |
| Series I | Employment of Women and Children |
| Series J | Education |
| Series K | Agriculture |
| Series L | Professional workers |
| Series M | Social Insurance |
| Series N | Statistics |
| Series O | Migration |
| Series P | Seamen |
| Series NS | New Series |