15: The Personal Letter
( \newcommand{\kernel}{\mathrm{null}\,}\)
Use a personalized letter when your communication needs a personal touch or when warmth or sincerity is essential. You may use it to write to an individual on a private matter for praise, condolence, sponsorship, etc. Keep it brief, preferably no longer than one page, and avoid using acronyms. For envelopes, always use United States Postal Service (USPS) abbreviations for addresses. For further information, see USPS Publication 28, Postal Addressing Standards.