- Publication venue
- [s.n.]
- Publication date
- 01/01/1972
- Field of study
- Publication venue
- L.E.I.
- Publication date
- 01/01/1976
- Field of study
- Publication venue
- L.E.I.
- Publication date
- 01/01/1967
- Field of study
- Publication venue
- L.E.I.
- Publication date
- 01/01/1964
- Field of study
- Publication venue
- L.E.I.
- Publication date
- 01/01/1979
- Field of study
- Publication venue
- L.E.I.
- Publication date
- 01/01/1976
- Field of study
- Publication venue
- L.E.I.
- Publication date
- 01/01/1974
- Field of study
- Publication venue
- Landbouw-Economisch Instituut
- Publication date
- Field of study