This collection is a direct continuation of the already published Volume 2 of this documentary series, entitled "From the Bulgarian Post-Liberation Press (1878-1900)". It includes 477 materials from 32 periodicals (newspapers and magazines) published between 1900 and 1912. The volume is compiled as a specialized scientific publication, following a selected thematic and chronological structure. The selected materials are interesting and important for ethnologists not so much as documentary amateur descriptions of phenomena in Bulgarian folk culture, but rather as evidence of the processes of change within it. For the most part, these materials reflect urban culture, which is beginning to establish itself as the leading model in Bulgarian society. The collection will enrich the foundation of ethnological research with previously unused and specific data. It will also attract the interest of readers who are not familiar with this subject matter, offering them a broad panorama of Bulgarian life and culture in the first decade of the 20th century.