Cvancara, Alan M.Edible Wild Plants and Herbs: A Pocket Guide. McGraw-Hill Professional, 2001. A concise guide that will enable the reader to identify and use 50 common plants and herbs.
Peacock, James; Trevor Williams; and John H. Holden.Genes, Crops and the Environment. Cambridge University Press, 1993. Crop genetics and the need to conserve genetic diversity.