Re-order paragraphs

a) Library classification, system of arrangement adopted by a library to enable patrons to find its materials quickly and easily.

c) While cataloging provides information on the physical and topical nature of the book (or other item), classification, through assignment of a call number (consisting of class designation and author representation), locates the item in its library setting and, ideally, in the realm of knowledge.

b) Arranging similar things in some order according to some principle unites and controls information from various sources.