The book "Why do we need a public library? Materials for a campaign in favor of libraries" is a valuable resource not only for librarians, but also for everyone who is interested in the future of modern libraries. The book emphasizes the importance of public libraries in society, emphasizing their place as centers of culture, education and community. The authors share examples of successful library projects, innovative approaches to working with the audience, and strategies for attracting new readers. This book will be an important source of information for those fighting for the preservation and development of public libraries in today's world.