English, introductory to letter, planning of a business lettr, qualities of a letter, essentials of a good business letter, types of letters, techniques of letter writing, indexing anfd recording, delay letter and how to complete them, maintenance of office files and letters, business secrets letter, complaint letters, credit and collections letters, circular letters, letters for job application, (Topical Term)
Preferred form: English, introductory to letter, planning of a business lettr, qualities of a letter, essentials of a good business letter, types of letters, techniques of letter writing, indexing anfd recording, delay letter and how to complete them, maintenance of office files and letters, business secrets letter, complaint letters, credit and collections letters, circular letters, letters for job application,