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September 5, 2012
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Chicago Manual of Style:
"DO use the apostrophe to form the plural of an abbreviation that combines upper and lowercase letters or has interior periods:The department graduated five M.A.’s and two Ph.D.’s this year.NOTE: If you leave out the periods, you can write MAs but you’d still have to write PhD’s.DO use the apostrophe to form the plural of lowercase letters:Mind your p’s and q’s."
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