The description of each tree species follows the same pattern.
The exterior form of the tree is illustrated concisely, without text. A paragraph characterizing the sites explains, above all, the soil, climatic, and ecological conditions. Specific ecological aspects supplement the sections covering the distribution of the particular tree species. A map illustrating the geographical areas of distribution is of significant importance. It is also possible, in connection with a climate atlas, to interpret these maps ecologically. Microscopic representations, mostly cross-sections, define the tree-ring sequences given at the end of the description of each species. These representations are copies from X-ray photographs. Based on literary studies and personal observations, I have attempted to present each species in such a manner as to make it adaptable to chronological, ecological, and climatic studies. I have included brief summaries of previous dendrochronological studies to show how the species have been used in the past. An introductory chapter recapitulates particular wood anatomical and dendroecological basics. Of special importance are the climate diagrams, which, with only a few exceptions, have been taken from the standard work of Walter and Lieth (1960–1967).