Spelling Rules -- Making Noun Plurals - Page 10

Rule 25: From the plural of most abbreviations by adding "s" to the singular. See below. bldg. -- bldgs. vol. -- vols. par. -- pars. No. -- Nos. Dr. -- Drs. Bro. -- Bros

Rule 26: The plurals of a few single-letter abbreviations (such as p. for page and f. for the following page) consist of the single letter doubled. See below.

1. p. 64 page 64 2. pp. 64-72 -- pages 64 through 72 3. pp. 291 f. -- page 291 and following page 4. pp. 291 ff. -- page 291 and following pages 5. l. 23 -- line 23 6. ll. 23-24 -- lines 23 through 24 7. n. 3 -- note 3 8. nn. 3-4 -- notes 3 and 4

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