That ["Hubbert-fig-20.png"] image file -- (well, the "image" part of it) -- has been deleted; but anyone who is interested in seeing what it looked like when it 'did' contain the non-free image (which no longer resides on any "wikimedia dot org" web sites) can [feel free to] see the "archived" copy (as of '20100531145034') (that is, as of May 31, 2010 at 14:50:34), on the Wayback Machine web site at this URL. Just "FYI".
Hankwang at English Wikipedia, the copyright holder of this work, hereby publishes it under the following licenses:
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{{BotMoveToCommons|en.wikipedia}} {{Information |Description={{en|New presentation of data in figure 20 of http://www.hubbertpeak.com/hubbert/1956/1956.pdf . Meant as replacement for non-free [[:en::Image:Hubbert-fig-20.png]]. == Data == Data file "hcu