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A couple of nights ago I came across this picture of the Richfield Building on the USC site. I don't remember seeing it here before, but that's no guarantee! It's dated at November 26, 1957.
USC Digital Library
When I zoomed in, I noticed that a couple of the windows show advertisments for Richfield Boron Gasoline.
Details of picture above.
I can't find any references to Richfield Boron Gasoline in NLA, so here are a few contemporary advertisements:
Ebay
Ebay
Amazon
Ebay