The Oxford Library of English Usage 3 Books Volumes Box Set is a comprehensive collection of grammar and spelling rules in the English language. Published by Oxford Library in 1991, this set includes three hardcover books authored by A.J. Thomson. It is a valuable resource for those interested in English language teaching, spelling, and grammar, providing in-depth explanations and examples for improving language skills. This box set is a must-have for anyone looking to enhance their understanding of English usage and spelling.