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Abbreviations.
Brenda Gregoline
in AMA Manual of Style: A Guide for Authors and Editors (11 ed.)
For most all-capital abbreviations, the plural is formed by adding a lowercase s. Do not use an apostrophe before the s (see 8.7.5, Using Apostrophes to Form Plurals). The same format applies to abbreviations that end in a lowercase letter. Note: When plural all-capital abbreviations are found in an all-capital setting, such as a heading, the plural ...View:
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