1. A Dictionary of the Flowering Plants and Ferns;Airy Shaw,1973
2. A Dictionary of the Flowering Plants and Ferns;Airy Shaw,1973
3. A Dictionary of the Flowering Plants and Ferns;Airy Shaw,1973
4. Alkaloids of the genus Erythroxylum;Al-Yahya;Journal of the Chemical Society, Perkin Transactions,1979
5. Silica in Timbers;Amos,1952