1. 2. W. Davies, 1927 . Seeds mixture problems: Soil germination, seedling and plant establishment with particular reference to the effect of environmental and agronomic factors. II. Field trials .Welsh Plant Breeding Station Bulletin Series H, No. 6.pp.39 -63 .
2. A belt press for separating juices from fibrous pulps
3. 5. A. G. Davis, Unpublished thesis .