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& Courtesy titles, professional titles, and ecclesiastical titles are abbreviated as follows: Always abbreviated: Mr., Mrs., Messrs, Jr.. Sr. M., Mme. (Monsieur, Madame) Rev,, Very Rev, Most Rev., (Christian name or titl: mrast follow}, Rev. John Jones, Rev. Dr. Jones {not Rev, ~ Tones) Abbreviated only before full name: Prof. Albert Brown Professor Brown Mogr. Robert Jones Monsignor jones Col. Thomat Smith Colonel Smith Not abbreviated: Brother Mother Father Sister Units of Measurement Units of measurement are spelled in text. Where abbre- viations are appropriate, as in tables or in statistical matter, they should be used only when they follow a number or sym- bol. Abbreviations and their usage should conform to an ac- cepted standard. See also Nambera and Units of Measure, page 17. ime measurements 1. In expressing time, the number (if less than 100), as dll as the unit of measure, is spelled in text. fifty-five seconds fourteen hours 250 years ago (se also “Approximations” } 2. Names of months are spelled in text. In bibliographies, tables, etc. they may be abbreviated when followed by the day, Days of the week are spelled. January 18 (Jan. 18 in references, ate.) January, 1953 4. Time of day is expressed a2 follows: 2 vs, 3:30 Pmt. (capital letters) two o'clock 4. Centuries and decades may be expressed in numbers or spelled. the 1030s, the thisties ca. 1900 B.c., av. 1900 (cxpital letters) the 1800s, the nineteenth century (omit a.p.) 5. In ranges the full year is repeated. 1850 to 1895 (1850-1805 in tables or parenthetical references) the school (or fiscal) year 1852-1053 the decade 1930-1040 Federal agencies and other organized bodtes 1. Periods are omitted in initial-letter abbreviations standing for names of well-known organized bodies. AFL-C1O (American Federation of Labor—Congress of dustrial Organizations) BAE (Bureau of Agriculture Economics) CIO (Congress of Industrial Organizations} FBI (Federal Bureau of Investigation) NEA (National Education Association) NLRB (National Labor Relations Board) PTA (Parent-Teachers Association. Note omission of hyphen.) 2. The name “United States” is spelled except when part of the title of s government department, bureau, or office. United States Army U.S. Children’s Bureau United States Tariff Commission U.S. Department of Agriculture United States Supreme Court (sometimes further abbreviated United States Treasury USDA) United States Government US, Office of Education States States are spelled in text. In footnotes and references they are abbreviated (except Idaho, Iowa, Maine, Ohio, and Utah) after the name of a city or county, according to the list given in the Government Printing Office Style Manual (exception: Ore. instead of Oreg. for Oregon). Urbane Oe aty, Coan, footnotes and references caly) 1s