This book is preoccupied with the general reader, and is addressed to him even though its authors are mainly concerned with talking to the librarian. The goal of the book is to explain the principles and standards that must be followed in the process of selecting the books that are supplied to libraries. It is known that public libraries receive a greater share of attention, the greater awareness of the size of the library, whether small, medium or large, without neglecting to talk about university and school libraries. The book's direct interest in the librarian involves a great interest in the reader who visits it. Librarians and information specialists' primary job is to serve the reader and the researcher by providing many services such as: counseling and guidance service, which is one of the necessary services provided by the public library, as it is the house of scientific research. Scientific research students, whatever their field of research, turn to it because it contains many important and vital books in all branches of science and knowledge, which enables researchers to obtain references with ease and without incurring high financial costs.