Handbook of Library Economics Third and Commemorative Edition is an important and authoritative publication created by James Duff Brown and William Charles Berwick Sayers. The book highlights issues related to the organization and management of libraries, their functioning, and also provides practical advice on improving the work of libraries. The publication includes the latest trends in the field of librarianship and current aspects of modern library development. This book is a must for professionals in the field of library administration and can serve as a valuable reference for anyone interested in librarianship.