Virtual Reference Shelf, Library of Congress

http://www.loc.gov/rr/askalib/virtualref.html#abbreviations

Do you for some kind of inexplicable reason want to look up The Guide to Government Abbreviations? It’s here. In fact, the Virtual Reference Shelf has in-depth information on Abbreviations, Art, Business, Calculators, Children & Parents (e.g., The U.S. Government Guide for Kids), Dictionaries & Thesauri, Directories, Education, Encyclopedias, English Language and Literature, Full-Text Books & Periodicals, Genealogy, General Reference Resources, Grant Resources, Health/Medical, U.S. History – and more. Check it out. It is more than you probably expect. -CCE