Bigfoot Reference 

The magazine is better known as just the Engineering and Mining Journal, which you may have a difficult time finding, depending on where you live.  I ran across the article a few years ago while researching something else, and made a copy.  It is clearly derived from press accounts, and treats the incident as a joke.  My whole point in citing it was to show that the incident, whatever it was, was not (entirely) created 40+ years after the fact.  If you leave me your email, I will scan the page and email you a PDF.