What do a.m. and p.m. stand for? Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Related Abbreviations for n.b.s.


  1. National Biological Survey
  2. National Bureau of Standards; now NIST: National Institute of Standards and Technology
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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