UABC
Universidad Autonoma de Baja California
UABCS
Universidad Autonoma de Baja California Sur
UAC
United Anglers of California
UAG
Universidad Autonoma de Guerrero
UAM
Universidad Autonoma Metropolitana
UANL
Universidad Autonoma de Nuevo Leon
UAS
Universidad Autonoma de Sinaloa
UASC
United Anglers of Southern California
UC
Universidad Colima
UCAR
University Corporation of Atmospheric Research
UDC
Universal Decimal Classification
UDS
Unit Diving Supervisor
UFA
United Fishermen of Alaska
UFA
United Fishing Agency
UFMA
United Fishermen's Marketing Association
UH
University of Hawaii
UMA
Upland Management Area
UN
United Nations
UNAM
(Mexico) Autonomous National University of Mexico
UNAM
(Universidad Nacional Autónoma de México)
UNCED
United Nations Conference on Environment and Development
UNCLOS
United Nations Convention on the Law of the Sea
UNCOPUOS
United Nations Committee on the Peaceful Uses of Space
UNCR
Universidad Nacional de Costa Rica
UNDP
United Nations Development Program
UNEP
United Nations Environmental Program
UNESCO
United Nations Educational, Scientific and Cultural Organization
UNGA
United Nations General Assembly
UNIDO
United Nations Industrial Development Organization
UNLOS
United Nations Office of the Law of the Sea
UNOLS
University National Oceanographic Laboratory System
UNU
United Nations University
UOR
Undulating Oceanographic Recorder
UR
Utilization Research
URI
University of Rhode Island
US
Under Secretary
USACE
U.S. Army Corps of Engineers
USAID
U.S. Agency for International Development
USBCF
U.S. Bureau of Commercial Fisheries
USC
U.S. Code
USCG
U.S. Coast Guard
USCS
U.S. Customs Service
USDA
U.S. Department of Agriculture
USDA-ARS
U.S. Department of Agriculture - Agriculture Research Service
USFWS
U.S. Fish and Wildlife Service
USGCRP
U.S. Global Change Research Program
USGS
U.S. Geological Survey
USIA
U.S. Information Agency
USIS
U.S. Information Service
USN
U.S. Navy
USNO
U.S. Naval Observatory
USP
University of South Pacific
USPS
U.S. Postal Service
USSR
Union of Soviet Socialist Republics
UST
U.S. Treaties
UST
Underground Storage Tank
USTF
U.S. Tuna Foundation
USTR
Office of the U.S. Trade Representative
USTTA
U.S. Travel and Tourism Administration
USWCS
U.S. West Communication Services
UTC
Universal Time Coordinated
UV
Ultraviolet
UV
Universidad Veracruz
UV-B
Ultraviolet-Biological