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Publisher
- institute of electrical and electronics engineers, inc.10
- penton media, inc., penton business media, inc. and their subsidiaries6
- ubm canon llc5
- the mcgraw-hill companies, inc.4
- reed business information, inc. (us)3
- pennwell publishing corp.2
- american institute of physics, inc.1
- ihs global, inc.1
- mining media, inc1