![](http://timelifeblog.files.wordpress.com/2014/07/140728-san-francisco-05.jpg?w=632)
Diego Rivera working on pencil sketches for huge mural depicting Pan-American unity, Palace of Fine Arts, San Francisco, 1941.
Peter Stackpole—The LIFE Picture Collection/Getty Images
Life.com has posted some images from back in the day. Check them out here →
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