استانداردها

American Water Works Association (AWWA) (235)

APHA,American Public Health Association (202)

AWWA,American Water Works Association (202)

WEF,Water Environment Federation (202)

BSI - British Standards Institution (174)

ETSI - European Telecommunications Standards Institute (90)

AASHTO - American Association of State Highway and Transportation Officials (85)

IEEE - The Institute of Electrical and Electronics Engineers, Inc. (40)

2000 - 2024 (83275)

1922 - 1999 (6183)