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Penton (company) - Wikipedia
Penton Media, Inc. -- Company History
We Are Penton Media Group – pentonmediagroup.com
Penton Media, Inc. - Encyclopedia.com
Penton Media - MidOcean Partners
Penton Media
Penton Media, Inc. - IT History Society
Penton Media - Company Profile - Tracxn
Penton Media gets bankruptcy plan OK, to exit soon | Reuters
Informa to Buy Penton for $1.56 Billion | TSNN Trade Show News