Awdur
- Hume, T. M. (Terry Martyn), 1948- 2 canlyniadau
- National Water and Soil Conservation Authority (N.Z.) 2 canlyniadau
- New Zealand. Water and Soil Directorate 2 canlyniadau
- Clark, C. L. (Claire Louise), 1953- 1 canlyniadau
- Harris, T. F. W. (Thomas Frank Wyndham) 1 canlyniadau
- New Zealand. Water and Soil Division 1 canlyniadau
- Simmers, I. (Ian), 1937- 1 canlyniadau
- Thompson, Keith 1 canlyniadau