| Description | Number 7. Insect pests in cacao store. A paper read at the Exhibition of Rubber, Other Tropical Products and Allied Industries. June 1921. Illus. 16pp. 1923. *KNAPP (ARTHUR WILLIAM) Research Chemist to Messrs. Cadbury Bros. Ltd..
Number 8. The application of science to cacao production. Illus. 8pp. 1923. *KNAPP (ARTHUR WILLIAM) Research Chemist to Messrs. Cadbury Bros. Ltd.. |