Survey research :
| Institution: | International Institute of Social History |
|---|---|
| Format: | TEXT |
| Published: |
Het Spectrum,
1971.
Utrecht : |
| Subjects: | |
| Online Access: | http://hdl.handle.net/10622/293668E3-0755-44F9-8A59-F2D79BF48AD7 |
| Published: | 1971. |
|---|