- Publication venue
- [s.n.]
- Publication date
- 01/01/1973
- Field of study
- Publication venue
- Landbouw-Economisch Instituut
- Publication date
- 01/01/1968
- Field of study
- Publication venue
- L.E.I.
- Publication date
- 01/01/1977
- Field of study
- Publication venue
- Landbouw-Economisch Instituut
- Publication date
- 01/01/1971
- Field of study
- Publication venue
- Landbouw-Economisch Instituut
- Publication date
- 01/01/1968
- Field of study