Category Contains the number of abbreviations
Air Force219
Alliances1323
Authorities609
Bureaus493
Civic & Municipal456
Commerce333
Council2766
Employment1164
Energy2207
Environmental4102
FBI Files521
FDA3962
Federation939
Fire Departments435
Immigration256
Institutes5632
Law & Legal7507
Legislation666
Military31683
NASA11598
Navy6091
Nazi Regime152
Planning1055
Police2727
Politics2530
State & Local4621
Suppliers298
Transportation7855
United Nations1337
US Government6615
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