The atlas is divided into six-thematic blocks, with the focus of the work in blocks 3 to 6, which capture the changes in the national and religious structure of Bohemian Silesia and adjacent northern Moravia during the 20th and 21st centuries. The individual map sheets are based primarily on census results, which allows using the same methodology and clearly defined long-term development trends of individual nationalities, but it is also able to capture sudden and radical changes, such as the displacement of the German population after 1945. Atlas also deals specifically with the development of two nationally and religiously specific areas of Bohemian Silesia, which are the Těšín and Hlučín regions. The atlas also includes an extensive theoretical part, which deals not only with the technical description of the atlas preparation, but also with the characteristics of the researched area. The final output thus represents a unique act, which for the first time comprehensively and methodically captures the national and religious changes of Czech Silesia and northern Moravia.