This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help.
DescriptionNACementKilnsPercentPC.png
English: *2008-05-30T19:36:59Z Alvin-cs (Talk
Date
22 July 2008 (original upload date)
Source
Transferred from en.wikipedia to Commons by Teratornis using CommonsHelper.
Author
Original uploader was LinguisticDemographer (later versions by 718 Bot) at en.wikipedia
Licensing
Public domainPublic domainfalsefalse
This work has been released into the public domain by its author, LinguisticDemographer at English Wikipedia. This applies worldwide. In some countries this may not be legally possible; if so: LinguisticDemographer grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse
Original upload log
The original description page was here. All following user names refer to en.wikipedia.