The work of Nickolay Ivanovich Vavilov has formed the basis of much of the study of plant genetic resources that is carried out. In recognition of his contribution to plant science, and to commemorate the centenary of his birth, a collection of all of Vavgilov's works on the origin and geography of cultivated plant species was published in Russian in 1987. This English translation sees the publication of these seminal papers in their original form, but not original language, for the first time. The structure of the book, with papers arranged in chronological order from 1920 to 1940, provides a unique opportunity to retrace both the development Vavilov's theories on cultivated plants and his gradual creation of a definite terminology. the book will be of great interest to all those concerned with the development of cultivated plant species, not only in terms of the history of this discipline and its status, but also its future direction.