1. Bleasdale, J. K. A., 1962. 13th Annual Report of National Vegetable Research Station, 37–38.
2. Green, H. C., 1960. Potato planting experiments. J. agric. Engng Res. 5: 276–282.
3. Green, H. C., 1962. Row widths and inter row cultivation of potatoes. Eur. Potato J. 5: 57–67.
4. Wayman, J. A., 1967. Experiments to investigate some of the problems in mechanisation associated with the cultivation of potatoes in beds, 1963–1966. Dep. Note/232/CD Nat. Inst. agric. Engng, Silsoe (unpublished).