Colin Norman

Tree and Field Crops of the Wetter Regions of the Tropics (Intermediate tropical agriculture series)

By Williams, Colin Norman, Chen, W.Y., Chew, Rajaratnam, J.A.

Agronomy of the Major Tropical Crops (Oxford in Asia College Texts)

By Williams, Colin Norman

Vegetable Production in the Tropics (Intermediate tropical agriculture series)

By Williams, Colin Norman, etc., Uzo, J. O, Peregrine, W.T.H.